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Fossil-fuel related emissions declined

Greenland (global-adventures.us): Fossil-fuel related emissions of both methane and ethane, two of the most abundant hydrocarbons in the atmosphere, declined at the end of the twentieth century. The causes of the decline in methane emission rates to the atmosphere have been puzzling scientists for some time.

Fossil fuels are a common source of both ethane and methane. Methane has many other sources, but we know most of the ethane in the atmosphere today is from fossil fuels.

http://www.global-adventures.us/2011/08/14/fossil-fuel-emissions/