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If the global warming potential (GWP) of CH₄ is 25 times greater than CO₂ over a 100-year period, and if CH₄ emissions account for 10% of total U.S. GHG emissions, then the U.S. impact on global warming is much greater through CH₄ emissions than through CO₂. [I'm calculating it like this: volume x GWP = impact i.e. 10 x 25 =250 for methane, and 90 x 1 = 90 for CO₂]. So CH₄ has an impact 2.77 times greater (250/90) than CO₂. Surely, you need to emphasize this?
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