| Increase of Methane Concentration |
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| q | The
atmospheric concentration of methane (CH4) has |
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| increased
by 151% (1060 ppb9) since
1750 and |
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| continues
to increase. |
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| q | The present
CH4 concentration has not been exceeded |
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| during the
past 420,000 years. |
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| q | Slightly more than half of current CH4 emissions
are |
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| anthropogenic (e.g., use of fossil fuels, cattle,
rice |
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| agriculture
and landfills). |
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