A Smut Above: Unhealthy Soot in the Air Could Also Promote Global Warming

There are 3 comments on the Scientific American story from Jan 17, 2013, titled A Smut Above: Unhealthy Soot in the Air Could Also Promote Global Warming. In it, Scientific American reports that:

Every year in the Northern Hemisphere about 7.5 million metric tons of black carbon, the equivalent of more than 100 times Earth's total biomass, enters the air from internal combustion engines, forest fires and other sources.

Join the discussion below, or Read more at Scientific American.

SpaceBlues

Houston, TX

#1 Jan 17, 2013
When the news says 'A' "may play a larger role in global warming than previously estimated, according to a new study," they mean the scientists have done further work and have improved their understanding of A.

A Smut Above: Unhealthy Soot in the Air Could Also Promote Global Warming
PHD

Overton, TX

#2 Jan 18, 2013
When they say "A" they really really mean in my opinion. Translated to they really really don't know.

Since: Jan 13

Fairfax, VA

#3 Jan 20, 2013
PHD wrote:
When they say "A" they really really mean in my opinion. Translated to they really really don't know.
"Troll alert"

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