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Posted Sat Jun 20 2009: from
BBC:
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How aerosols mask climate change http://apocadocs.com/s.pl?1245459485
The pollution particles he studied include industrial aerosols such as sulphates, nitrates found in smoke from burning agricultural waste and black carbon (soot) from diesel engines and other forms of combustion.
"Global models of the emission of these aerosols suggest the cooling effect they have cancels out approximately 10 percent of the global warming caused by greenhouse gases," explained Jim Haywood, an aerosol researcher from the UK Met Office, who was not involved in this study.
"But satellite methods that detect the amount of aerosols in the atmosphere suggest a cooling effect that cancels out about 20 percent."
By identifying the source of this discrepancy, Dr Myhre was able to reconcile the two approaches and come up with a more precise estimate -- closer to 10 percent.
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[Read more stories about:
airborne pollutants, albedo effect, global warming]
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