They say the key is to reduce emissions of two powerful and fast-acting causes of global warming — methane and soot.
Carbon dioxide is the chief greenhouse gas and the one world leaders
have spent the most time talking about controlling. Scientists say
carbon dioxide from fossil fuels like coal and oil is a bigger overall
cause of global warming, but reducing methane and soot offers quicker
fixes.
Soot also is a big health problem, so dramatically cutting
it with existing technology would save between 700,000 and 4.7 million
lives each year, according to the team’s research published online
Thursday in the journal Science. Since soot causes rainfall patterns to
shift, reducing it would cut down on droughts in southern Europe and
parts of Africa and ease monsoon problems in Asia, the study says.
Two
dozen scientists from around the world ran computer models of 400
different existing pollution control measures and came up with 14
methods that attack methane and soot. The idea has been around for more
than a decade and the same authors worked on a United Nations report
last year, but this new study is far more comprehensive.
All 14
methods — capturing methane from landfills and coal mines, cleaning up
cook stoves and diesel engines, and changing agriculture techniques for
rice paddies and manure collection — are being used efficiently in many
places, but aren’t universally adopted, said the study’s lead author,
Drew Shindell of NASA.
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