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| q | Methane |
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| – | A variable gas in small but recently increasing concentrations |
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| – | Released to the atmosphere through fossil fuel activities, livestock |
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| digestion, and agriculture cultivation (esp. rice) |
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| – | As a very effective absorber of terrestrial radiation it plays an |
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| active role in near surface warming |
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| Annual
increases in |
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| atmospheric methane |
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