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I notice that Hansen says that aerosols are the 2nd highest human forcing.
I thought it was soot now.


Soot contains black carbon. Soot can be suspended in the air, where it is an aerosol, or deposited on the ground. As an aerosol black carbon warms the planet through several mechanisms. If black carbon is on deposited on a high albedo surface such as ice or snow, it lowers the albedo and absorbs sunlight which warms the black carbon and can melt the snow or ice.

It seems the biggest impact of black carbon is when it is an aerosol.

So you and Hansen are both correct.

http://en.wikipedia.org/wiki/Black_carbon
http://e360.yale.edu/feature/carl_zimmer_black_carbon_and_gl...
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