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Atmospheric greenhouse gas concentrations (CSI 013) - Assessment published Nov 2010
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The global average concentrations of various greenhouse
gasses in the atmosphere reached their highest levels ever recorded, and
continue increasing. The combustion of fossil fuels from human activities and
land-use changes are largely responsible for this increase. The concentration in 2008 of the six greenhouse
gases (GHG) included in the Kyoto Protocol has reached 438 ppm CO 2
equivalent, which is an increase of 160 ppm compared to the pre-industrial
level. Considering all GHGs (incl. ozone and various cooling aerosols),
the concentration has reached a value of 399 ppm CO 2 equivalents
in 2008, which is 121 ppm higher than in pre-industrial times. The
concentration of CO 2 -the most important greenhouse gas- has
reached in 2008 a level of 385 ppm, and in 2009 387 ppm. This is an
increase of nearly 110 ppm compared to the pre-industrial level. Without climate policy, the overall concentration
of the six Kyoto gasses is projected to increase up to 638-1360 ppm CO 2
-equivalent by 2100, whereas the concentration of all GHGs may increase up
to 608-1535 ppm CO 2 -equivalent. The global atmospheric GHG concentration
of 450 ppm CO 2 -equivalent could already become exceeded up 2015
(depending on climate policy and definitions)
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Atmospheric greenhouse gas concentrations
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Atmospheric greenhouse gas concentrations (CSI 013) - Assessment published Oct 2005
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The atmospheric concentration of carbon dioxide (CO 2 ), the main greenhouse gas, has increased by 34 % compared with pre-industrial levels as a result of human activities, with an accelerated rise since 1950. Other greenhouse gas concentrations have also risen as a result of human activities. The present concentrations of CO 2 and CH 4 have not been exceeded during the past 420 000 years and the present N 2 O concentration during at least the past 1 000 years. IPCC (2001) baseline projections show that greenhouse gas concentrations are likely to exceed the level of 550 ppm CO 2 -equivalent in the next few decades (before 2050).
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Atmospheric greenhouse gas concentrations
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Atmospheric greenhouse gas concentrations (CSI 013) - Assessment published Apr 2008
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The global average concentrations of various greenhouse gasses in the atmosphere reached their highest levels ever recorded, and continue increasing. The combustion of fossil fuels from human activities and land-use changes are largely responsible for this increase. The concentration in 2006 of the six greenhouse gases (GHG) included in the Kyoto Protocol has reached 433 ppm CO2 equivalent, which is an increase of 155 ppm compared to the pre-industrial level. Considering all GHGs (incl. ozone and various cooling aerosols), the concentration is 393 ppm CO2 equivalents, which is 115 ppm higher than in pre-industrial times. The concentration of CO2 - the most important greenhouse gas - has reached in 2006 a level of 381 ppm, showing an increase of 103 ppm compared to the pre-industrial level. Under the IPCC scenarios the overall concentration of the six Kyoto gasses is projected to increase up to 638-1360 ppm CO2 -equivalent by 2100, whereas the concentration of all GHGs may increase up to 608-1535 ppm CO2 -equivalent. The global atmospheric GHG concentration of 450 ppm CO2-equivalent may be exceeded between 2015 and 2030.
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Atmospheric greenhouse gas concentrations
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Atmospheric greenhouse gas concentrations (CSI 013) - Assessment published Mar 2009
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The global average concentrations of various greenhouse gasses in the atmosphere reached their highest levels ever recorded, and continue increasing. The combustion of fossil fuels from human activities and land-use changes are largely responsible for this increase. The concentration in 2007 of the six greenhouse gases (GHG) included in the Kyoto Protocol has reached 436 ppm CO 2 -equivalent, which is an increase of 158 ppm compared to the pre-industrial level. Considering all GHGs (incl. ozone and various cooling aerosols), the concentration is 396 ppm CO 2 -equivalents, which is 115 ppm higher than in pre-industrial times. The concentration of CO 2 - the most important greenhouse gas- has reached in 2007 a level of 383 ppm, and in 2008 385 ppm. This is an increase of nearly 110 ppm compared to the pre-industrial level. Under the IPCC scenarios the overall concentration of the six Kyoto gasses is projected to increase up to 638-1360 ppm CO 2 -equivalent by 2100, whereas the concentration of all GHGs may increase up to 608-1535 ppm CO 2 -equivalent. The global atmospheric GHG concentration of 450 ppm CO 2 -equivalent may be exceeded between 2015 and 2030.
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Atmospheric greenhouse gas concentrations
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Atmospheric concentration of Methane (ppb)
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The figure shows the global atmospheric concentration of methane up to 2010.
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Atmospheric greenhouse gas concentrations (CSI 013) - Assessment published Jan 2013
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The global average concentrations of various greenhouse gases in the atmosphere have reached the highest levels ever recorded, and concentrations are increasing. The combustion of fossil fuels from human activities and land-use changes are largely responsible for this increase.
The concentration of all GHGs, including cooling aerosols that are relevant in the context of the 2 o C temperature target, reached a value of 403 ppm CO 2 equivalents in 2010, exceeding the 400 ppm for first time.
The concentration in 2010 of the six greenhouse gases (GHG) included in the Kyoto Protocol has reached 444 ppm CO 2 equivalent, an increase of 165 ppm (around +60 %) compared to pre-industrial levels.
The concentration of CO 2 , the most important greenhouse gas, reached a level of 389 ppm by 2010, and further increased to 391 ppm in 2011. This is an increase of approximately 112 ppm (around +40 %) compared to pre-industrial levels.
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Atmospheric greenhouse gas concentrations
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Contribution of the different GHGs to the overall greenhouse gas concentration in 1950, 1990 and 2010
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Contribution of the different GHGs as included in the Kyoto and Montreal protocol to the overall greenhouse gas concentration in 1950, 1990 and 2010.
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Atmospheric concentration of Nitrous Oxide (ppb)
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The figure shows the global atmospheric concentration of nitrous oxide up to 2010.
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Atmospheric concentration of N2O (ppb)
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The concentrations of the individual GHGs under the Kyoto protocol have reached new highs in 2009
The figure shows the atmospheric concentration of N2O
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Atmospheric concentration of CO2 (ppm)
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The figure shows the atmospheric concentration of CO2
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