Check out this article from May 2010 about
the people of Memphis?
Kaiser used its own system -- 454 clinics and 36 hospitals, using
electronic health records -- as its laboratory. The answer, published
Wednesday in the journal Health Affairs, is that the potential
environmental benefit is to reduce carbon dioxide emissions as much as
1.7 million tons a year. That's the pollution equivalent of taking more
than 300,000 cars off America's roads."