I R A Darth Aggie wrote:
On Fri, 14 Dec 2007 19:05:25 -0800,
David , in
wrote:
+ I R A Darth Aggie wrote:
+ On Thu, 13 Dec 2007 19:55:11 -0800,
+ none , in
+ wrote:
+
+ + Contrails? Puleeze. Even I can see the difference, and I ain't no
+ + Meteorologist.
+
+ Yeah, they're contrails. Deal with it, little conspiracy theorist.
+
+
+ Of sinister origin or not, they do affect the weather.

Yes. Now calculate how much of an affect they contribute.


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.

"This result shows the increased cirrus coverage, attributable to air
traffic, could account for nearly all of the warming observed over the
United States for nearly 20 years starting in 1975, but it is important
to acknowledge contrails would add to and not replace any greenhouse gas
effect," said Patrick Minnis, senior research scientist at NASA's
Langley Research Center in Hampton, Va. The study was published April 15
in the Journal of Climate. "During the same period, warming occurred in
many other areas where cirrus coverage decreased or remained steady," he
added.

"This study demonstrates that human activity has a visible and
significant impact on cloud cover and, therefore, on climate. It
indicates that contrails should be included in climate change
scenarios," Minnis said."