Contents 1 Gases in Earth's atmosphere 1.1 Greenhouse gases 1.2 Non-greenhouse gases 1.3 Indirect radiative effects 1.4 Contribution of clouds to Earth's greenhouse effect 2 Impacts on the overall greenhouse effect 2.1 Proportion of direct effects at a given moment 2.2 Atmospheric lifetime 2.3 Radiative forcing 2.4 Global warming potential 3 Natural and anthropogenic sources 3.1 Ice cores 3.2 Changes since the Industrial Revolution 4 Anthropogenic greenhouse gases 4.1 Sectors 4.1.1 Tourism 4.1.2 Road Haulage 5 Role of water vapor 6 Direct greenhouse gas emissions 6.1 Regional and national attribution of emissions 6.2 From land-use change 6.3 Greenhouse gas intensity 6.4 Cumulative and historical emissions 6.5 Changes since a particular base year 6.6 Annual emissions 6.7 Top emitter countries 6.7.1 Annual 6.7.2 Cumulative 6.8 Embedded emissions 6.9 Effect of policy 6.10 Projections 6.11 Relative CO2 emission from various fuels 7 Life-cycle greenhouse-gas emissions of energy sources 8 Removal from the atmosphere ("sinks") 8.1 Natural processes 8.2 Negative emissions 9 History of scientific research 10 See also 11 References 12 Bibliography 13 External links 13.1 Carbon dioxide emissions

Gases in Earth's atmosphere[edit] Main articles: Greenhouse effect and Atmosphere of Earth See also: Global warming and Carbon dioxide in Earth's atmosphere Atmospheric absorption and scattering at different wavelengths of electromagnetic waves. The largest absorption band of carbon dioxide is not far from the maximum in the thermal emission from ground, and it partly closes the window of transparency of water; hence its major effect. Greenhouse gases[edit] Greenhouse gases are those that absorb and emit infrared radiation in the wavelength range emitted by Earth.[1] In order, the most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H 2O) Carbon dioxide (CO 2) Methane (CH 4) Nitrous oxide (N 2O) Ozone (O 3) Chlorofluorocarbons (CFCs) Hydrofluorocarbons (incl. HCFCs and HFCs) Atmospheric concentrations of greenhouse gases are determined by the balance between sources (emissions of the gas from human activities and natural systems) and sinks (the removal of the gas from the atmosphere by conversion to a different chemical compound).[13] The proportion of an emission remaining in the atmosphere after a specified time is the "airborne fraction" (AF). The annual airborne fraction is the ratio of the atmospheric increase in a given year to that year's total emissions. As of 2006 the annual airborne fraction for CO2 was about 0.45. The annual airborne fraction increased at a rate of 0.25 ± 0.21% per year over the period 1959–2006.[14] Non-greenhouse gases[edit] The major atmospheric constituents, nitrogen (N 2), oxygen (O 2), and argon (Ar), are not greenhouse gases because molecules containing two atoms of the same element such as N 2 and O 2 and monatomic molecules such as argon (Ar) have no net change in the distribution of their electrical charges when they vibrate. Hence they are almost totally unaffected by infrared radiation. Although molecules containing two atoms of different elements such as carbon monoxide (CO) or hydrogen chloride (HCl) absorb infrared radiation, these molecules are short-lived in the atmosphere owing to their reactivity and solubility. Therefore, they do not contribute significantly to the greenhouse effect and often are omitted when discussing greenhouse gases. Indirect radiative effects[edit] The false colors in this image represent concentrations of carbon monoxide in the lower atmosphere, ranging from about 390 parts per billion (dark brown pixels), to 220 parts per billion (red pixels), to 50 parts per billion (blue pixels).[15] Some gases have indirect radiative effects (whether or not they are greenhouse gases themselves). This happens in two main ways. One way is that when they break down in the atmosphere they produce another greenhouse gas. For example, methane and carbon monoxide (CO) are oxidized to give carbon dioxide (and methane oxidation also produces water vapor, as discussed later). Oxidation of CO to CO2 directly produces an unambiguous increase in radiative forcing although the reason is subtle. The peak of the thermal IR emission from Earth's surface is very close to a strong vibrational absorption band of CO2 (15 microns, or 667 cm−1). On the other hand, the single CO vibrational band only absorbs IR at much shorter wavelengths (4.7 microns, or 2145 cm−1), where the emission of radiant energy from Earth's surface is at least a factor of ten lower. Oxidation of methane to CO2, which requires reactions with the OH radical, produces an instantaneous reduction in radiative absorption and emission since CO2 is a weaker greenhouse gas than methane, although CO2 has a longer lifetime. As described below this is not the whole story, since the oxidations of CO and CH 4 are intertwined by both consuming OH radicals. In any case, the calculation of the total radiative effect needs to include both the direct and indirect forcing. A second type of indirect effect happens when chemical reactions in the atmosphere involving these gases change the concentrations of greenhouse gases. For example, the destruction of non-methane volatile organic compounds (NMVOCs) in the atmosphere can produce ozone. The size of the indirect effect can depend strongly on where and when the gas is emitted.[16] Methane has a number of indirect effects in addition to forming CO2. First, the main chemical that reacts with methane in the atmosphere is the hydroxyl radical (OH), thus more methane means that the concentration of OH goes down. Effectively, methane increases its own atmospheric lifetime and therefore its overall radiative effect. The second effect is that the oxidation of methane can produce ozone. Third, as well as making CO2, the oxidation of methane produces water; this is a major source of water vapor in the stratosphere, which is otherwise very dry. CO and NMVOCs also produce CO2 when they are oxidized. They remove OH from the atmosphere, and this leads to higher concentrations of methane. The surprising effect of this is that the global warming potential of CO is three times that of CO2.[17] The same process that converts NMVOCs to carbon dioxide can also lead to the formation of tropospheric ozone. Halocarbons have an indirect effect because they destroy stratospheric ozone. Finally, hydrogen can lead to ozone production and CH 4 increases as well as producing water vapor in the stratosphere.[16] Contribution of clouds to Earth's greenhouse effect[edit] The major non-gas contributor to Earth's greenhouse effect, clouds, also absorb and emit infrared radiation and thus have an effect on radiative properties of the greenhouse gases. Clouds are water droplets or ice crystals suspended in the atmosphere.[18][19]

Impacts on the overall greenhouse effect[edit] Schmidt et al. (2010)[20] analysed how individual components of the atmosphere contribute to the total greenhouse effect. They estimated that water vapor accounts for about 50% of Earth's greenhouse effect, with clouds contributing 25%, carbon dioxide 20%, and the minor greenhouse gases and aerosols accounting for the remaining 5%. In the study, the reference model atmosphere is for 1980 conditions. Image credit: NASA.[21] The contribution of each gas to the greenhouse effect is determined by the characteristics of that gas, its abundance, and any indirect effects it may cause. For example, the direct radiative effect of a mass of methane is about 84 times stronger than the same mass of carbon dioxide over a 20-year time frame[22] but it is present in much smaller concentrations so that its total direct radiative effect is smaller, in part due to its shorter atmospheric lifetime. On the other hand, in addition to its direct radiative impact, methane has a large, indirect radiative effect because it contributes to ozone formation. Shindell et al. (2005)[23] argue that the contribution to climate change from methane is at least double previous estimates as a result of this effect.[24] When ranked by their direct contribution to the greenhouse effect, the most important are:[18][not in citation given] Compound   Formula   Concentration in atmosphere[25] (ppm) Contribution (%) Water vapor and clouds H 2O 10–50,000(A) 36–72%   Carbon dioxide CO2 ~400 9–26% Methane CH 4 ~1.8 4–9%   Ozone O 3 2–8(B) 3–7%   notes: (A) Water vapor strongly varies locally[26] (B) The concentration in stratosphere. About 90% of the ozone in Earth's atmosphere is contained in the stratosphere. In addition to the main greenhouse gases listed above, other greenhouse gases include sulfur hexafluoride, hydrofluorocarbons and perfluorocarbons (see IPCC list of greenhouse gases). Some greenhouse gases are not often listed. For example, nitrogen trifluoride has a high global warming potential (GWP) but is only present in very small quantities.[27] Proportion of direct effects at a given moment[edit] It is not possible to state that a certain gas causes an exact percentage of the greenhouse effect. This is because some of the gases absorb and emit radiation at the same frequencies as others, so that the total greenhouse effect is not simply the sum of the influence of each gas. The higher ends of the ranges quoted are for each gas alone; the lower ends account for overlaps with the other gases.[18][19] In addition, some gases such as methane are known to have large indirect effects that are still being quantified.[28] Atmospheric lifetime[edit] Aside from water vapor, which has a residence time of about nine days,[29] major greenhouse gases are well mixed and take many years to leave the atmosphere.[30] Although it is not easy to know with precision how long it takes greenhouse gases to leave the atmosphere, there are estimates for the principal greenhouse gases. Jacob (1999)[31] defines the lifetime τ {\displaystyle \tau } of an atmospheric species X in a one-box model as the average time that a molecule of X remains in the box. Mathematically τ {\displaystyle \tau } can be defined as the ratio of the mass m {\displaystyle m} (in kg) of X in the box to its removal rate, which is the sum of the flow of X out of the box ( F o u t {\displaystyle F_{out}} ), chemical loss of X ( L {\displaystyle L} ), and deposition of X ( D {\displaystyle D} ) (all in kg/s): τ = m F o u t + L + D {\displaystyle \tau ={\frac {m}{F_{out}+L+D}}} .[31] If one stopped pouring any of this gas into the box, then after a time τ {\displaystyle \tau } , its concentration would be about halved. The atmospheric lifetime of a species therefore measures the time required to restore equilibrium following a sudden increase or decrease in its concentration in the atmosphere. Individual atoms or molecules may be lost or deposited to sinks such as the soil, the oceans and other waters, or vegetation and other biological systems, reducing the excess to background concentrations. The average time taken to achieve this is the mean lifetime. Carbon dioxide has a variable atmospheric lifetime, and cannot be specified precisely.[32] The atmospheric lifetime of CO2 is estimated of the order of 30–95 years.[33] This figure accounts for CO2 molecules being removed from the atmosphere by mixing into the ocean, photosynthesis, and other processes. However, this excludes the balancing fluxes of CO2 into the atmosphere from the geological reservoirs, which have slower characteristic rates.[34] Although more than half of the CO2 emitted is removed from the atmosphere within a century, some fraction (about 20%) of emitted CO2 remains in the atmosphere for many thousands of years.[35] [36] [37] Similar issues apply to other greenhouse gases, many of which have longer mean lifetimes than CO2. E.g., N2O has a mean atmospheric lifetime of 121 years.[22] Radiative forcing[edit] Earth absorbs some of the radiant energy received from the sun, reflects some of it as light and reflects or radiates the rest back to space as heat.[38] Earth's surface temperature depends on this balance between incoming and outgoing energy.[38] If this energy balance is shifted, Earth's surface becomes warmer or cooler, leading to a variety of changes in global climate.[38] A number of natural and man-made mechanisms can affect the global energy balance and force changes in Earth's climate.[38] Greenhouse gases are one such mechanism.[38] Greenhouse gases absorb and emit some of the outgoing energy radiated from Earth's surface, causing that heat to be retained in the lower atmosphere.[38] As explained above, some greenhouse gases remain in the atmosphere for decades or even centuries, and therefore can affect Earth's energy balance over a long period.[38] Radiative forcing quantifies the effect of factors that influence Earth's energy balance, including changes in the concentrations of greenhouse gases.[38] Positive radiative forcing leads to warming by increasing the net incoming energy, whereas negative radiative forcing leads to cooling.[38] Global warming potential[edit] The global warming potential (GWP) depends on both the efficiency of the molecule as a greenhouse gas and its atmospheric lifetime. GWP is measured relative to the same mass of CO2 and evaluated for a specific timescale. Thus, if a gas has a high (positive) radiative forcing but also a short lifetime, it will have a large GWP on a 20-year scale but a small one on a 100-year scale. Conversely, if a molecule has a longer atmospheric lifetime than CO2 its GWP will increase with the timescale considered. Carbon dioxide is defined to have a GWP of 1 over all time periods. Methane has an atmospheric lifetime of 12 ± 3 years. The 2007 IPCC report lists the GWP as 72 over a time scale of 20 years, 25 over 100 years and 7.6 over 500 years.[39] A 2014 analysis, however, states that although methane's initial impact is about 100 times greater than that of CO2, because of the shorter atmospheric lifetime, after six or seven decades, the impact of the two gases is about equal, and from then on methane's relative role continues to decline.[40] The decrease in GWP at longer times is because methane is degraded to water and CO2 through chemical reactions in the atmosphere. Examples of the atmospheric lifetime and GWP relative to CO2 for several greenhouse gases are given in the following table: Atmospheric lifetime and GWP relative to CO2 at different time horizon for various greenhouse gases Gas name Chemical formula Lifetime (years)[22] Global warming potential (GWP) for given time horizon 20-yr[22] 100-yr[22] 500-yr[39] Carbon dioxide CO2 30–95 1 1 1 Methane CH 4 12 84 28 7.6 Nitrous oxide N 2O 121 264 265 153 CFC-12 CCl 2F 2 100 10 800 10 200 5 200 HCFC-22 CHClF 2 12 5 280 1 760 549 Tetrafluoromethane        CF 4 50 000 4 880 6 630 11 200 Hexafluoroethane C 2F 6 10 000 8 210 11 100 18 200 Sulfur hexafluoride SF 6 3 200 17 500 23 500 32 600 Nitrogen trifluoride NF 3 500 12 800 16 100 20 700 The use of CFC-12 (except some essential uses) has been phased out due to its ozone depleting properties.[41] The phasing-out of less active HCFC-compounds will be completed in 2030.[42] Carbon dioxide in Earth's atmosphere if half of global-warming emissions[43][44] are not absorbed. (NASA simulation; 9 November 2015) Nitrogen dioxide 2014 – global air quality levels (released 14 December 2015).[45]

Natural and anthropogenic sources[edit] Top: Increasing atmospheric carbon dioxide levels as measured in the atmosphere and reflected in ice cores. Bottom: The amount of net carbon increase in the atmosphere, compared to carbon emissions from burning fossil fuel. This diagram shows a simplified representation of the contemporary global carbon cycle. Changes are measured in gigatons of carbon per year (GtC/y). Canadell et al. (2007) estimated the growth rate of global average atmospheric CO2 for 2000–2006 as 1.93 parts-per-million per year (4.1 petagrams of carbon per year).[46] Aside from purely human-produced synthetic halocarbons, most greenhouse gases have both natural and human-caused sources. During the pre-industrial Holocene, concentrations of existing gases were roughly constant, because the large natural sources and sinks roughly balance. In the industrial era, human activities have added greenhouse gases to the atmosphere, mainly through the burning of fossil fuels and clearing of forests.[47][48] The 2007 Fourth Assessment Report compiled by the IPCC (AR4) noted that "changes in atmospheric concentrations of greenhouse gases and aerosols, land cover and solar radiation alter the energy balance of the climate system", and concluded that "increases in anthropogenic greenhouse gas concentrations is very likely to have caused most of the increases in global average temperatures since the mid-20th century".[49] In AR4, "most of" is defined as more than 50%. Abbreviations used in the two tables below: ppm = parts-per-million; ppb = parts-per-billion; ppt = parts-per-trillion; W/m2 = watts per square metre Current greenhouse gas concentrations[50] Gas Pre-1750 tropospheric concentration[51] Recent tropospheric concentration[52] Absolute increase since 1750 Percentage increase since 1750 Increased radiative forcing (W/m2)[53] Carbon dioxide (CO2) 280 ppm[54] 395.4 ppm[55] 115.4 ppm 41.2% 1.88 Methane (CH 4) 700 ppb[56] 1893 ppb /[57] 1762 ppb[57] 1193 ppb / 1062 ppb 170.4% / 151.7% 0.49 Nitrous oxide (N 2O) 270 ppb[53][58] 326 ppb /[57] 324 ppb[57] 56 ppb / 54 ppb 20.7% / 20.0% 0.17 Tropospheric ozone (O 3) 237 ppb[51] 337 ppb[51] 100 ppb 42% 0.4[59] Relevant to radiative forcing and/or ozone depletion; all of the following have no natural sources and hence zero amounts pre-industrial[50] Gas Recent tropospheric concentration Increased radiative forcing (W/m2) CFC-11 (trichlorofluoromethane) (CCl 3F) 236 ppt / 234 ppt 0.061 CFC-12 (CCl 2F 2) 527 ppt / 527 ppt 0.169 CFC-113 (Cl 2FC-CClF 2) 74 ppt / 74 ppt 0.022 HCFC-22 (CHClF 2) 231 ppt / 210 ppt 0.046 HCFC-141b (CH 3CCl 2F) 24 ppt / 21 ppt 0.0036 HCFC-142b (CH 3CClF 2) 23 ppt / 21 ppt 0.0042 Halon 1211 (CBrClF 2) 4.1 ppt / 4.0 ppt 0.0012 Halon 1301 (CBrClF 3) 3.3 ppt / 3.3 ppt 0.001 HFC-134a (CH 2FCF 3) 75 ppt / 64 ppt 0.0108 Carbon tetrachloride (CCl 4) 85 ppt / 83 ppt 0.0143 Sulfur hexafluoride (SF 6) 7.79 ppt /[60] 7.39 ppt[60] 0.0043 Other halocarbons Varies by substance collectively 0.02 Halocarbons in total 0.3574 400,000 years of ice core data Ice cores provide evidence for greenhouse gas concentration variations over the past 800,000 years (see the following section). Both CO2 and CH 4 vary between glacial and interglacial phases, and concentrations of these gases correlate strongly with temperature. Direct data does not exist for periods earlier than those represented in the ice core record, a record that indicates CO2 mole fractions stayed within a range of 180 ppm to 280 ppm throughout the last 800,000 years, until the increase of the last 250 years. However, various proxies and modeling suggests larger variations in past epochs; 500 million years ago CO2 levels were likely 10 times higher than now.[61] Indeed, higher CO2 concentrations are thought to have prevailed throughout most of the Phanerozoic eon, with concentrations four to six times current concentrations during the Mesozoic era, and ten to fifteen times current concentrations during the early Palaeozoic era until the middle of the Devonian period, about 400 Ma.[62][63][64] The spread of land plants is thought to have reduced CO2 concentrations during the late Devonian, and plant activities as both sources and sinks of CO2 have since been important in providing stabilising feedbacks.[65] Earlier still, a 200-million year period of intermittent, widespread glaciation extending close to the equator (Snowball Earth) appears to have been ended suddenly, about 550 Ma, by a colossal volcanic outgassing that raised the CO2 concentration of the atmosphere abruptly to 12%, about 350 times modern levels, causing extreme greenhouse conditions and carbonate deposition as limestone at the rate of about 1 mm per day.[66] This episode marked the close of the Precambrian eon, and was succeeded by the generally warmer conditions of the Phanerozoic, during which multicellular animal and plant life evolved. No volcanic carbon dioxide emission of comparable scale has occurred since. In the modern era, emissions to the atmosphere from volcanoes are only about 1% of emissions from human sources.[66][67][68] Ice cores[edit] Measurements from Antarctic ice cores show that before industrial emissions started atmospheric CO2 mole fractions were about 280 parts per million (ppm), and stayed between 260 and 280 during the preceding ten thousand years.[69] Carbon dioxide mole fractions in the atmosphere have gone up by approximately 35 percent since the 1900s, rising from 280 parts per million by volume to 387 parts per million in 2009. One study using evidence from stomata of fossilized leaves suggests greater variability, with carbon dioxide mole fractions above 300 ppm during the period seven to ten thousand years ago,[70] though others have argued that these findings more likely reflect calibration or contamination problems rather than actual CO2 variability.[71][72] Because of the way air is trapped in ice (pores in the ice close off slowly to form bubbles deep within the firn) and the time period represented in each ice sample analyzed, these figures represent averages of atmospheric concentrations of up to a few centuries rather than annual or decadal levels. Changes since the Industrial Revolution[edit] Recent year-to-year increase of atmospheric CO2. Major greenhouse gas trends. Since the beginning of the Industrial Revolution, the concentrations of most of the greenhouse gases have increased. For example, the mole fraction of carbon dioxide has increased from 280 ppm to 400 ppm, or 120 ppm over modern pre-industrial levels. The first 30 ppm increase took place in about 200 years, from the start of the Industrial Revolution to 1958; however the next 90 ppm increase took place within 56 years, from 1958 to 2014.[73][74] Recent data also shows that the concentration is increasing at a higher rate. In the 1960s, the average annual increase was only 37% of what it was in 2000 through 2007.[75] Today, the stock of carbon in the atmosphere increases by more than 3 million tonnes per annum (0.04%) compared with the existing stock.[clarification needed] This increase is the result of human activities by burning fossil fuels, deforestation and forest degradation in tropical and boreal regions.[76] The other greenhouse gases produced from human activity show similar increases in both amount and rate of increase. Many observations are available online in a variety of Atmospheric Chemistry Observational Databases.

Anthropogenic greenhouse gases[edit] This graph shows changes in the annual greenhouse gas index (AGGI) between 1979 and 2011. [77] The AGGI measures the levels of greenhouse gases in the atmosphere based on their ability to cause changes in Earth's climate.[77] This bar graph shows global greenhouse gas emissions by sector from 1990 to 2005, measured in carbon dioxide equivalents.[78] Modern global CO2 emissions from the burning of fossil fuels. Since about 1750 human activity has increased the concentration of carbon dioxide and other greenhouse gases. Measured atmospheric concentrations of carbon dioxide are currently 100 ppm higher than pre-industrial levels.[79] Natural sources of carbon dioxide are more than 20 times greater than sources due to human activity,[80] but over periods longer than a few years natural sources are closely balanced by natural sinks, mainly photosynthesis of carbon compounds by plants and marine plankton. As a result of this balance, the atmospheric mole fraction of carbon dioxide remained between 260 and 280 parts per million for the 10,000 years between the end of the last glacial maximum and the start of the industrial era.[81] It is likely that anthropogenic (i.e., human-induced) warming, such as that due to elevated greenhouse gas levels, has had a discernible influence on many physical and biological systems.[82] Future warming is projected to have a range of impacts, including sea level rise,[83] increased frequencies and severities of some extreme weather events,[83] loss of biodiversity,[84] and regional changes in agricultural productivity.[84] The main sources of greenhouse gases due to human activity are: burning of fossil fuels and deforestation leading to higher carbon dioxide concentrations in the air. Land use change (mainly deforestation in the tropics) account for up to one third of total anthropogenic CO2 emissions.[81] livestock enteric fermentation and manure management,[85] paddy rice farming, land use and wetland changes, man-made lakes,[86] pipeline losses, and covered vented landfill emissions leading to higher methane atmospheric concentrations. Many of the newer style fully vented septic systems that enhance and target the fermentation process also are sources of atmospheric methane. use of chlorofluorocarbons (CFCs) in refrigeration systems, and use of CFCs and halons in fire suppression systems and manufacturing processes. agricultural activities, including the use of fertilizers, that lead to higher nitrous oxide (N 2O) concentrations. The seven sources of CO2 from fossil fuel combustion are (with percentage contributions for 2000–2004):[87] Seven main fossil fuel combustion sources Contribution (%) Liquid fuels (e.g., gasoline, fuel oil) 36% Solid fuels (e.g., coal) 35% Gaseous fuels (e.g., natural gas) 20% Cement production  3 % Flaring gas industrially and at wells < 1%   Non-fuel hydrocarbons < 1%   "International bunker fuels" of transport not included in national inventories[88]  4 % Carbon dioxide, methane, nitrous oxide (N 2O) and three groups of fluorinated gases (sulfur hexafluoride (SF 6), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs)) are the major anthropogenic greenhouse gases,[89]:147[90] and are regulated under the Kyoto Protocol international treaty, which came into force in 2005.[91] Emissions limitations specified in the Kyoto Protocol expired in 2012.[91] The Cancún agreement, agreed in 2010, includes voluntary pledges made by 76 countries to control emissions.[92] At the time of the agreement, these 76 countries were collectively responsible for 85% of annual global emissions.[92] Although CFCs are greenhouse gases, they are regulated by the Montreal Protocol, which was motivated by CFCs' contribution to ozone depletion rather than by their contribution to global warming. Note that ozone depletion has only a minor role in greenhouse warming though the two processes often are confused in the media. On 15 October 2016, negotiators from over 170 nations meeting at the summit of the United Nations Environment Programme reached a legally binding accord to phase out hydrofluorocarbons (HFCs) in an amendment to the Montreal Protocol.[93][94][95] Sectors[edit] This section needs expansion with: Information on emissions from other sectors. You can help by adding to it. (July 2013) This figure shows the relative fraction of anthropogenic greenhouse gases coming from each of eight categories of sources, as estimated by the Emission Database for Global Atmospheric Research version 3.2, fast track 2000 project [1]. These values are intended to provide a snapshot of global annual greenhouse gas emissions in the year 2000. The top panel shows the sum over all anthropogenic greenhouse gases, weighted by their global warming potential over the next 100 years. This consists of 72% carbon dioxide, 18% methane, 8% nitrous oxide and 1% other gases. Lower panels show the comparable information for each of these three primary greenhouse gases, with the same coloring of sectors as used in the top chart. Segments with less than 1% fraction are not labeled. Tourism[edit] According to UNEP global tourism is closely linked to climate change. Tourism is a significant contributor to the increasing concentrations of greenhouse gases in the atmosphere. Tourism accounts for about 50% of traffic movements. Rapidly expanding air traffic contributes about 2.5% of the production of CO2. The number of international travelers is expected to increase from 594 million in 1996 to 1.6 billion by 2020, adding greatly to the problem unless steps are taken to reduce emissions.[96] Road Haulage[edit] The road haulage industry plays a part in production of CO2, contributing around 20% of the UK's total carbon emissions a year, with only the energy industry having a larger impact at around 39%.[97] Average carbon emissions within the haulage industry are falling—in the thirty-year period from 1977 to 2007, the carbon emissions associated with a 200-mile journey fell by 21 percent; NOx emissions are also down 87 percent, whereas journey times have fallen by around a third.[98] Due to their size, HGVs often receive criticism regarding their CO2 emissions; however, rapid development in engine technology and fuel management is having a largely positive effect.

Role of water vapor[edit] Increasing water vapor in the stratosphere at Boulder, Colorado. Water vapor accounts for the largest percentage of the greenhouse effect, between 36% and 66% for clear sky conditions and between 66% and 85% when including clouds.[19] Water vapor concentrations fluctuate regionally, but human activity does not directly affect water vapor concentrations except at local scales, such as near irrigated fields. Indirectly, human activity that increases global temperatures will increase water vapor concentrations, a process known as water vapor feedback.[99] The atmospheric concentration of vapor is highly variable and depends largely on temperature, from less than 0.01% in extremely cold regions up to 3% by mass in saturated air at about 32 °C.[100] (See Relative humidity#other important facts.) The average residence time of a water molecule in the atmosphere is only about nine days, compared to years or centuries for other greenhouse gases such as CH 4 and CO2.[101] Thus, water vapor responds to and amplifies effects of the other greenhouse gases. The Clausius–Clapeyron relation establishes that more water vapor will be present per unit volume at elevated temperatures. This and other basic principles indicate that warming associated with increased concentrations of the other greenhouse gases also will increase the concentration of water vapor (assuming that the relative humidity remains approximately constant; modeling and observational studies find that this is indeed so). Because water vapor is a greenhouse gas, this results in further warming and so is a "positive feedback" that amplifies the original warming. Eventually other earth processes offset these positive feedbacks, stabilizing the global temperature at a new equilibrium and preventing the loss of Earth's water through a Venus-like runaway greenhouse effect.[102]

Direct greenhouse gas emissions[edit] Between the period 1970 to 2004, greenhouse gas emissions (measured in CO2-equivalent)[103] increased at an average rate of 1.6% per year, with CO2 emissions from the use of fossil fuels growing at a rate of 1.9% per year.[104][105] Total anthropogenic emissions at the end of 2009 were estimated at 49.5 gigatonnes CO2-equivalent.[106]:15 These emissions include CO2 from fossil fuel use and from land use, as well as emissions of methane, nitrous oxide and other greenhouse gases covered by the Kyoto Protocol. At present, the primary source of CO2 emissions is the burning of coal, natural gas, and petroleum for electricity and heat.[107] Regional and national attribution of emissions[edit] See also: Kyoto Protocol and government action According to the Environmental Protection Agency (EPA), GHG emissions in the United States can be traced from different sectors.[108] There are several different ways of measuring greenhouse gas emissions, for example, see World Bank (2010)[109]:362 for tables of national emissions data. Some variables that have been reported[110] include: Definition of measurement boundaries: Emissions can be attributed geographically, to the area where they were emitted (the territory principle) or by the activity principle to the territory produced the emissions. These two principles result in different totals when measuring, for example, electricity importation from one country to another, or emissions at an international airport. Time horizon of different gases: Contribution of a given greenhouse gas is reported as a CO2 equivalent. The calculation to determine this takes into account how long that gas remains in the atmosphere. This is not always known accurately and calculations must be regularly updated to reflect new information. What sectors are included in the calculation (e.g., energy industries, industrial processes, agriculture etc.): There is often a conflict between transparency and availability of data. The measurement protocol itself: This may be via direct measurement or estimation. The four main methods are the emission factor-based method, mass balance method, predictive emissions monitoring systems, and continuous emissions monitoring systems. These methods differ in accuracy, cost, and usability. These different measures are sometimes used by different countries to assert various policy/ethical positions on climate change (Banuri et al., 1996, p. 94).[111] This use of different measures leads to a lack of comparability, which is problematic when monitoring progress towards targets. There are arguments for the adoption of a common measurement tool, or at least the development of communication between different tools.[110] Emissions may be measured over long time periods. This measurement type is called historical or cumulative emissions. Cumulative emissions give some indication of who is responsible for the build-up in the atmospheric concentration of greenhouse gases (IEA, 2007, p. 199).[112] The national accounts balance would be positively related to carbon emissions. The national accounts balance shows the difference between exports and imports. For many richer nations, such as the United States, the accounts balance is negative because more goods are imported than they are exported. This is mostly due to the fact that it is cheaper to produce goods outside of developed countries, leading the economies of developed countries to become increasingly dependent on services and not goods. We believed that a positive accounts balance would means that more production was occurring in a country, so more factories working would increase carbon emission levels.[113] Emissions may also be measured across shorter time periods. Emissions changes may, for example, be measured against a base year of 1990. 1990 was used in the United Nations Framework Convention on Climate Change (UNFCCC) as the base year for emissions, and is also used in the Kyoto Protocol (some gases are also measured from the year 1995).[89]:146,149 A country's emissions may also be reported as a proportion of global emissions for a particular year. Another measurement is of per capita emissions. This divides a country's total annual emissions by its mid-year population.[109]:370 Per capita emissions may be based on historical or annual emissions (Banuri et al., 1996, pp. 106–107).[111] From land-use change[edit] Greenhouse gas emissions from agriculture, forestry and other land use, 1970–2010. Land-use change, e.g., the clearing of forests for agricultural use, can affect the concentration of greenhouse gases in the atmosphere by altering how much carbon flows out of the atmosphere into carbon sinks.[114] Accounting for land-use change can be understood as an attempt to measure "net" emissions, i.e., gross emissions from all sources minus the removal of emissions from the atmosphere by carbon sinks (Banuri et al., 1996, pp. 92–93).[111] There are substantial uncertainties in the measurement of net carbon emissions.[115] Additionally, there is controversy over how carbon sinks should be allocated between different regions and over time (Banuri et al., 1996, p. 93).[111] For instance, concentrating on more recent changes in carbon sinks is likely to favour those regions that have deforested earlier, e.g., Europe. Greenhouse gas intensity[edit] See also: List of countries by carbon intensity Greenhouse gas intensity in the year 2000, including land-use change. Carbon intensity of GDP (using PPP) for different regions, 1982–2011. Carbon intensity of GDP (using MER) for different regions, 1982–2011. Greenhouse gas intensity is a ratio between greenhouse gas emissions and another metric, e.g., gross domestic product (GDP) or energy use. The terms "carbon intensity" and "emissions intensity" are also sometimes used.[116] Emission intensities may be calculated using market exchange rates (MER) or purchasing power parity (PPP) (Banuri et al., 1996, p. 96).[111] Calculations based on MER show large differences in intensities between developed and developing countries, whereas calculations based on PPP show smaller differences. Cumulative and historical emissions[edit] Cumulative energy-related CO2 emissions between the years 1850–2005 grouped into low-income, middle-income, high-income, the EU-15, and the OECD countries. Cumulative energy-related CO2 emissions between the years 1850–2005 for individual countries. Map of cumulative per capita anthropogenic atmospheric CO2 emissions by country. Cumulative emissions include land use change, and are measured between the years 1950 and 2000. Regional trends in annual CO2 emissions from fuel combustion between 1971 and 2009. Regional trends in annual per capita CO2 emissions from fuel combustion between 1971 and 2009. Cumulative anthropogenic (i.e., human-emitted) emissions of CO2 from fossil fuel use are a major cause of global warming,[117] and give some indication of which countries have contributed most to human-induced climate change.[118]:15 Top-5 historic CO2 contributors by region over the years 1800 to 1988 (in %) Region Industrial CO2 Total CO2 OECD North America 33.2 29.7 OECD Europe 26.1 16.6 Former USSR 14.1 12.5 China   5.5   6.0 Eastern Europe   5.5   4.8 The table above to the left is based on Banuri et al. (1996, p. 94).[111] Overall, developed countries accounted for 83.8% of industrial CO2 emissions over this time period, and 67.8% of total CO2 emissions. Developing countries accounted for industrial CO2 emissions of 16.2% over this time period, and 32.2% of total CO2 emissions. The estimate of total CO2 emissions includes biotic carbon emissions, mainly from deforestation. Banuri et al. (1996, p. 94)[111] calculated per capita cumulative emissions based on then-current population. The ratio in per capita emissions between industrialized countries and developing countries was estimated at more than 10 to 1. Including biotic emissions brings about the same controversy mentioned earlier regarding carbon sinks and land-use change (Banuri et al., 1996, pp. 93–94).[111] The actual calculation of net emissions is very complex, and is affected by how carbon sinks are allocated between regions and the dynamics of the climate system. Non-OECD countries accounted for 42% of cumulative energy-related CO2 emissions between 1890 and 2007.[119]:179–180 Over this time period, the US accounted for 28% of emissions; the EU, 23%; Russia, 11%; China, 9%; other OECD countries, 5%; Japan, 4%; India, 3%; and the rest of the world, 18%.[119]:179–180 Changes since a particular base year[edit] See also: Kyoto Protocol § Government action and emissions Between 1970 and 2004, global growth in annual CO2 emissions was driven by North America, Asia, and the Middle East.[120] The sharp acceleration in CO2 emissions since 2000 to more than a 3% increase per year (more than 2 ppm per year) from 1.1% per year during the 1990s is attributable to the lapse of formerly declining trends in carbon intensity of both developing and developed nations. China was responsible for most of global growth in emissions during this period. Localised plummeting emissions associated with the collapse of the Soviet Union have been followed by slow emissions growth in this region due to more efficient energy use, made necessary by the increasing proportion of it that is exported.[87] In comparison, methane has not increased appreciably, and N 2O by 0.25% y−1. Using different base years for measuring emissions has an effect on estimates of national contributions to global warming.[118]:17–18[121] This can be calculated by dividing a country's highest contribution to global warming starting from a particular base year, by that country's minimum contribution to global warming starting from a particular base year. Choosing between different base years of 1750, 1900, 1950, and 1990 has a significant effect for most countries.[118]:17–18 Within the G8 group of countries, it is most significant for the UK, France and Germany. These countries have a long history of CO2 emissions (see the section on Cumulative and historical emissions). Annual emissions[edit] Per capita anthropogenic greenhouse gas emissions by country for the year 2000 including land-use change. Annual per capita emissions in the industrialized countries are typically as much as ten times the average in developing countries.[89]:144 Due to China's fast economic development, its annual per capita emissions are quickly approaching the levels of those in the Annex I group of the Kyoto Protocol (i.e., the developed countries excluding the USA).[122] Other countries with fast growing emissions are South Korea, Iran, and Australia (which apart from the oil rich Persian Gulf states, now has the highest percapita emission rate in the world). On the other hand, annual per capita emissions of the EU-15 and the USA are gradually decreasing over time.[122] Emissions in Russia and Ukraine have decreased fastest since 1990 due to economic restructuring in these countries.[123] Energy statistics for fast growing economies are less accurate than those for the industrialized countries. For China's annual emissions in 2008, the Netherlands Environmental Assessment Agency estimated an uncertainty range of about 10%.[122] The greenhouse gas footprint refers to the emissions resulting from the creation of products or services. It is more comprehensive than the commonly used carbon footprint, which measures only carbon dioxide, one of many greenhouse gases. 2015 was the first year to see both total global economic growth and a reduction of carbon emissions.[124] Top emitter countries[edit] Global carbon dioxide emissions by country. The top 40 countries emitting all greenhouse gases, showing both that derived from all sources including land clearance and forestry and also the CO2 component excluding those sources. Per capita figures are included. Data taken from World Resources Institute, Washington. Note that Indonesia and Brazil show very much higher than on graphs simply showing fossil fuel use. See also: List of countries by carbon dioxide emissions, List of countries by carbon dioxide emissions per capita, List of countries by greenhouse gas emissions, and List of countries by greenhouse gas emissions per capita Annual[edit] In 2009, the annual top ten emitting countries accounted for about two-thirds of the world's annual energy-related CO2 emissions.[125] Top-10 annual energy-related CO2 emitters for the year 2009[citation needed] Country  % of global total annual emissions Tonnes of GHG per capita People's Rep. of China 23.6 5.1 United States 17.9 16.9 India 5.5 1.4 Russian Federation 5.3 10.8 Japan 3.8 8.6 Germany 2.6 9.2 Islamic Rep. of Iran 1.8 7.3 Canada 1.8 15.4 South Korea 1.8 10.6 United Kingdom 1.6 7.5 Cumulative[edit] Play media The C-Story of Human Civilization by PIK Top-10 cumulative energy-related CO2 emitters between 1850 and 2008[citation needed] Country  % of world total Metric tonnes CO2 per person United States 28.5 1,132.7 China 9.36 85.4 Russian Federation 7.95 677.2 Germany 6.78 998.9 United Kingdom 5.73 1,127.8 Japan 3.88 367 France 2.73 514.9 India 2.52 26.7 Canada 2.17 789.2 Ukraine 2.13 556.4 Embedded emissions[edit] One way of attributing greenhouse gas (GHG) emissions is to measure the embedded emissions (also referred to as "embodied emissions") of goods that are being consumed. Emissions are usually measured according to production, rather than consumption.[126] For example, in the main international treaty on climate change (the UNFCCC), countries report on emissions produced within their borders, e.g., the emissions produced from burning fossil fuels.[119]:179[127]:1 Under a production-based accounting of emissions, embedded emissions on imported goods are attributed to the exporting, rather than the importing, country. Under a consumption-based accounting of emissions, embedded emissions on imported goods are attributed to the importing country, rather than the exporting, country. Davis and Caldeira (2010)[127]:4 found that a substantial proportion of CO2 emissions are traded internationally. The net effect of trade was to export emissions from China and other emerging markets to consumers in the US, Japan, and Western Europe. Based on annual emissions data from the year 2004, and on a per-capita consumption basis, the top-5 emitting countries were found to be (in tCO2 per person, per year): Luxembourg (34.7), the US (22.0), Singapore (20.2), Australia (16.7), and Canada (16.6).[127]:5 Carbon Trust research revealed that approximately 25% of all CO2 emissions from human activities 'flow' (i.e., are imported or exported) from one country to another. Major developed economies were found to be typically net importers of embodied carbon emissions — with UK consumption emissions 34% higher than production emissions, and Germany (29%), Japan (19%) and the USA (13%) also significant net importers of embodied emissions.[128] Effect of policy[edit] See also: Kyoto Protocol and government action Governments have taken action to reduce greenhouse gas emissions (climate change mitigation). Assessments of policy effectiveness have included work by the Intergovernmental Panel on Climate Change,[129] International Energy Agency,[130][131] and United Nations Environment Programme.[132] Policies implemented by governments have included[133][134][135] national and regional targets to reduce emissions, promoting energy efficiency, and support for renewable energy such as Solar energy as an effective use of renewable energy because solar uses energy from the sun and does not release pollutants into the air. Countries and regions listed in Annex I of the United Nations Framework Convention on Climate Change (UNFCCC) (i.e., the OECD and former planned economies of the Soviet Union) are required to submit periodic assessments to the UNFCCC of actions they are taking to address climate change.[135]:3 Analysis by the UNFCCC (2011)[135]:8 suggested that policies and measures undertaken by Annex I Parties may have produced emission savings of 1.5 thousand Tg CO2-eq in the year 2010, with most savings made in the energy sector. The projected emissions saving of 1.5 thousand Tg CO2-eq is measured against a hypothetical "baseline" of Annex I emissions, i.e., projected Annex I emissions in the absence of policies and measures. The total projected Annex I saving of 1.5 thousand CO2-eq does not include emissions savings in seven of the Annex I Parties.[135]:8 Projections[edit] Further information: climate change scenario § Quantitative emissions projections See also: Global climate model § Projections of future climate change A wide range of projections of future emissions have been produced.[136] Rogner et al. (2007)[137] assessed the scientific literature on greenhouse gas projections. Rogner et al. (2007)[104] concluded that unless energy policies changed substantially, the world would continue to depend on fossil fuels until 2025–2030. Projections suggest that more than 80% of the world's energy will come from fossil fuels. This conclusion was based on "much evidence" and "high agreement" in the literature.[104] Projected annual energy-related CO2 emissions in 2030 were 40–110% higher than in 2000, with two-thirds of the increase originating in developing countries.[104] Projected annual per capita emissions in developed country regions remained substantially lower (2.8–5.1 tonnes CO2) than those in developed country regions (9.6–15.1 tonnes CO2).[138] Projections consistently showed increase in annual world emissions of "Kyoto" gases,[139] measured in CO2-equivalent) of 25–90% by 2030, compared to 2000.[104] Relative CO2 emission from various fuels[edit] One liter of gasoline, when used as a fuel, produces 2.32 kg (about 1300 liters or 1.3 cubic meters) of carbon dioxide, a greenhouse gas. One US gallon produces 19.4 lb (1,291.5 gallons or 172.65 cubic feet)[140][141][142] Mass of carbon dioxide emitted per quantity of energy for various fuels[143] Fuel name CO2 emitted (lbs/106 Btu) CO2 emitted (g/MJ) CO2 emitted (g/kWh) Natural gas 117 50.30 181.08 Liquefied petroleum gas 139 59.76 215.14 Propane 139 59.76 215.14 Aviation gasoline 153 65.78 236.81 Automobile gasoline 156 67.07 241.45 Kerosene 159 68.36 246.10 Fuel oil 161 69.22 249.19 Tires/tire derived fuel 189 81.26 292.54 Wood and wood waste 195 83.83 301.79 Coal (bituminous) 205 88.13 317.27 Coal (sub-bituminous) 213 91.57 329.65 Coal (lignite) 215 92.43 332.75 Petroleum coke 225 96.73 348.23 Tar-sand Bitumen [citation needed] [citation needed] [citation needed] Coal (anthracite) 227 97.59 351.32

Life-cycle greenhouse-gas emissions of energy sources[edit] Main article: Life-cycle greenhouse-gas emissions of energy sources A literature review of numerous energy sources CO2 emissions by the IPCC in 2011, found that, the CO2 emission value that fell within the 50th percentile of all total life cycle emissions studies conducted was as follows.[144] Lifecycle greenhouse gas emissions by electricity source. Technology Description 50th percentile (g CO2/kWhe) Hydroelectric reservoir 4 Ocean Energy wave and tidal 8 Wind onshore 12 Nuclear various generation II reactor types 16 Biomass various 18 Solar thermal parabolic trough 22 Geothermal hot dry rock 45 Solar PV Polycrystalline silicon 46 Natural gas various combined cycle turbines without scrubbing 469 Coal various generator types without scrubbing 1001

Removal from the atmosphere ("sinks")[edit] Natural processes[edit] Greenhouse gases can be removed from the atmosphere by various processes, as a consequence of: a physical change (condensation and precipitation remove water vapor from the atmosphere). a chemical reaction within the atmosphere. For example, methane is oxidized by reaction with naturally occurring hydroxyl radical, OH· and degraded to CO2 and water vapor (CO2 from the oxidation of methane is not included in the methane Global warming potential). Other chemical reactions include solution and solid phase chemistry occurring in atmospheric aerosols. a physical exchange between the atmosphere and the other compartments of the planet. An example is the mixing of atmospheric gases into the oceans. a chemical change at the interface between the atmosphere and the other compartments of the planet. This is the case for CO2, which is reduced by photosynthesis of plants, and which, after dissolving in the oceans, reacts to form carbonic acid and bicarbonate and carbonate ions (see ocean acidification). a photochemical change. Halocarbons are dissociated by UV light releasing Cl· and F· as free radicals in the stratosphere with harmful effects on ozone (halocarbons are generally too stable to disappear by chemical reaction in the atmosphere). Negative emissions[edit] Main article: Negative carbon dioxide emission A number of technologies remove greenhouse gases emissions from the atmosphere. Most widely analysed are those that remove carbon dioxide from the atmosphere, either to geologic formations such as bio-energy with carbon capture and storage[145][146][147] and carbon dioxide air capture,[147] or to the soil as in the case with biochar.[147] The IPCC has pointed out that many long-term climate scenario models require large-scale manmade negative emissions to avoid serious climate change.[148]

History of scientific research[edit] In the late 19th century scientists experimentally discovered that N 2 and O 2 do not absorb infrared radiation (called, at that time, "dark radiation"), while water (both as true vapor and condensed in the form of microscopic droplets suspended in clouds) and CO2 and other poly-atomic gaseous molecules do absorb infrared radiation. In the early 20th century researchers realized that greenhouse gases in the atmosphere made Earth's overall temperature higher than it would be without them. During the late 20th century, a scientific consensus evolved that increasing concentrations of greenhouse gases in the atmosphere cause a substantial rise in global temperatures and changes to other parts of the climate system,[149] with consequences for the environment and for human health.

See also[edit] Attribution of recent climate change Carbon accounting Carbon credit Carbon emissions reporting Carbon neutrality Carbon offset Cap and Trade Deforestation and climate change Effects of global warming Emission standard Environmental impact of aviation Greenhouse debt Hydrogen economy Integrated Carbon Observation System List of countries by electricity production from renewable sources List of international environmental agreements Low-carbon economy Methane Mobile source air pollution Paris Agreement Perfluorotributylamine Physical properties of greenhouse gases Sustainability measurement World energy consumption Zero-emissions vehicle

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(20 November 2007), "Contributions to Accelerating Atmospheric CO2 Growth from Economic Activity, Carbon Intensity, and Efficiency of Natural Sinks (Results and Discussion: Growth in Atmospheric CO2)", Proceedings of the National Academy of Sciences of the United States of America, 104 (47): 18866–18870, Bibcode:2007PNAS..10418866C, doi:10.1073/pnas.0702737104, PMC 2141868 , PMID 17962418  ^ "Chapter 1 Historical Overview of Climate Change Science — FAQ 1.3 Figure 1 description page 116" (PDF). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Intergovernmental Panel on Climate Change. 5 February 2007. Retrieved 25 April 2008.  ^ "Chapter 3, IPCC Special Report on Emissions Scenarios, 2000". Intergovernmental Panel on Climate Change. 2000. Retrieved 2010-10-16.  ^ Intergovernmental Panel on Climate Change (November 17, 2007). "Climate Change 2007: Synthesis Report" (PDF). p. 5. Retrieved 2017-01-20.  ^ a b From non-copyrighted source: Blasing, T. J. (February 2013), Current Greenhouse Gas Concentrations, doi:10.3334/CDIAC/atg.032 , on CDIAC 2013. Details on copyright status: Frequently Asked Global Change Questions, Q34: I would like to use a diagram, image, graph, table, or other materials from the CDIAC Web site. How can I obtain permission? Are there copyright restrictions?, retrieved 2012-09-26 , on CDIAC 2013. "All of the reports, graphics, data, and other information on the CDIAC Web site are freely and publicly available without copyright restrictions. However as a professional courtesy, we ask that the original data source be acknowledged." ^ a b c Ehhalt, D.; et al., "Ch 4. Atmospheric Chemistry and Greenhouse Gases", Table 4.1 , in IPCC TAR WG1 2001, pp. 244–245. Referred to by: Blasing, T. J. (February 2013), Current Greenhouse Gas Concentrations, doi:10.3334/CDIAC/atg.032 , on CDIAC 2013. Based on Blasing et al. (2013): Pre-1750 concentrations of CH4,N2O and current concentrations of O3, are taken from Table 4.1 (a) of the IPCC Intergovernmental Panel on Climate Change), 2001. Following the convention of IPCC (2001), inferred global-scale trace-gas concentrations from prior to 1750 are assumed to be practically uninfluenced by human activities such as increasingly specialized agriculture, land clearing, and combustion of fossil fuels. Preindustrial concentrations of industrially manufactured compounds are given as zero. The short atmospheric lifetime of ozone (hours-days) together with the spatial variability of its sources precludes a globally or vertically homogeneous distribution, so that a fractional unit such as parts per billion would not apply over a range of altitudes or geographical locations. Therefore a different unit is used to integrate the varying concentrations of ozone in the vertical dimension over a unit area, and the results can then be averaged globally. This unit is called a Dobson Unit (D.U.), after G. M. B. Dobson, one of the first investigators of atmospheric ozone. A Dobson unit is the amount of ozone in a column that, unmixed with the rest of the atmosphere, would be 10 micrometers thick at standard temperature and pressure. ^ Because atmospheric concentrations of most gases tend to vary systematically over the course of a year, figures given represent averages over a 12-month period for all gases except ozone (O3), for which a current global value has been estimated (IPCC, 2001, Table 4.1a). CO2 averages for year 2012 are taken from the National Oceanic and Atmospheric Administration, Earth System Research Laboratory, web site: maintained by Dr. Pieter Tans. For other chemical species, the values given are averages for 2011. These data are found on the CDIAC AGAGE web site: or the AGAGE home page: ^ a b Forster, P.; et al., "Ch 2: Changes in Atmospheric Constituents and in Radiative Forcing", Table 2.1 , in IPCC AR4 WG1 2007, p. 141. Referred to by: Blasing, T. J. (February 2013), Current Greenhouse Gas Concentrations, doi:10.3334/CDIAC/atg.032 , on CDIAC 2013. For the latest updates, see the NOAA Annual Greenhouse Gas Index at: [1]. ^ Prentice, I. C.; et al., "Ch 3. The Carbon Cycle and Atmospheric Carbon Dioxide", Executive summary, archived from the original on 7 December 2009 , in IPCC TAR WG1 2001, p. 185. Referred to by: Blasing, T. J. (February 2013), Current Greenhouse Gas Concentrations, doi:10.3334/CDIAC/atg.032 , on CDIAC 2013 ^ Recent CO2 concentration (395.4 ppm) is the 2013 average taken from globally averaged marine surface data given by the National Oceanic and Atmospheric Administration Earth System Research Laboratory, website: Please read the material on that web page and reference Dr. Pieter Tans when citing this average (Dr. Pieter Tans, NOAA/ESRL The oft-cited Mauna Loa average for 2012 is 393.8 ppm, which is a good approximation although typically about 1 ppm higher than the spatial average given above. Refer to for records back to the late 1950s. ^ ppb = parts-per-billion ^ a b c d The first value in a cell represents Mace Head, Ireland, a mid-latitude Northern-Hemisphere site, and the second value represents Cape Grim, Tasmania, a mid-latitude Southern-Hemisphere site. "Current" values given for these gases are annual arithmetic averages based on monthly background concentrations for year 2011. The SF 6 values are from the AGAGE gas chromatography – mass spectrometer (gc-ms) Medusa measuring system. Source: Advanced Global Atmospheric Gases Experiment (AGAGE) data posted on CDIAC web site at: These data are compiled from data on finer time scales in the ALE/GAGE/AGAGE database [2] (Prinn et al., 2000). These data represent the work of several investigators at various institutions; guidelines on citing the various parts of the AGAGE database are found within the ALE/GAGE/AGAGE database, see: [3]. ^ The pre-1750 value for N 2O is consistent with ice-core records from 10,000 B.C.E. through 1750 C.E.: "Summary for policymakers", Figure SPM.1, IPCC , in IPCC AR4 WG1 2007, p. 3. Referred to by: Blasing, T. J. (February 2013), Current Greenhouse Gas Concentrations, doi:10.3334/CDIAC/atg.032 , on CDIAC 2013 ^ Changes in stratospheric ozone have resulted in a decrease in radiative forcing of 0.05 W/m2: Forster, P.; et al., "Ch 2: Changes in Atmospheric Constituents and in Radiative Forcing", Table 2.12 , in IPCC AR4 WG1 2007, p. 204. Referred to by: Blasing, T. J. (February 2013), Current Greenhouse Gas Concentrations, doi:10.3334/CDIAC/atg.032 , on CDIAC 2013 ^ a b For SF 6 data from January 2004 onward see: [4]. For data from 1995 through 2004, see the National Oceanic and Atmospheric Administration (NOAA), Halogenated and other Atmospheric Trace Species (HATS) site at: [5]. Concentrations of SF 6 from 1970 through 1999, obtained from Antarctic firn (consolidated deep snow) air samples, can be found in W. T. Sturges et al. ^ File:Phanerozoic Carbon Dioxide.png ^ Berner, Robert A. (January 1994). "GEOCARB II: a revised model of atmospheric CO2 over Phanerozoic time" (PDF). 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