Friday, December 01, 2006

good news on global warming
Scientists at UC Irvine have determined that levels of atmospheric methane – an influential greenhouse gas – have stayed nearly flat for the past seven years, which follows a rise that spanned at least two decades....Methane has an atmospheric lifetime of about eight years. Carbon dioxide – the main greenhouse gas that is produced by burning fossil fuels for power generation and transportation – can last a century and has been accumulating steadily in the atmosphere.

Methane has a greater greenhouse effect than carbon dioxide, so this is good news, although methane is of lesser importance because of much smaller amounts in the atmosphere.

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