On Sun, 16 Dec 2007 17:33:06 -0800,
David , in
wrote:

+ http://www.nasa.gov/home/hqnews/2004...s_climate.html
+
+ " Chris Rink/Julia Cole
+ Langley Research Center, Hampton, Va.
+ (Phone: 757/864-6786/4052)

+ April 27, 2004
+ RELEASE : 04-140
+ Clouds Caused By Aircraft Exhaust May Warm The U.S. Climate
+
+
+ NASA scientists have found that cirrus clouds, formed by contrails from
+ aircraft engine exhaust, are capable of increasing average surface
+ temperatures enough to account for a warming trend in the United States
+ that occurred between 1975 and 1994.

Interesting.

I wonder, tho, how much increased albedo these clouds cause, and if
that's been measured?

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