Photo: Methane Emissions Rising (But You Wouldn't Know It), Study Says



Maps from 2005 show the distribution of methane at the Earth's surface (top) and in the stratosphere (lower), as calculated by a NASA computer model. Concentrations are shown in parts per million by volume.

A September 2006 study says that methane is on the rise in the atmosphere but that the trend is masked by decreases in methane outputs as wetlands dry out, possibly as a result of global warming.

Illustration courtesy GMAO Chemical Forecasts and GEOSCHEM NRT Simulations for ICARTT (top) and NASA GSFC Atmospheric Chemistry and Dynamics Branch (lower)


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