On Sun, 12 Dec 2004 17:32:20 +0100, Stefan
wrote in ::

Larry Dighera wrote:

Would that "opposite" be during the day or night? It also says: "...
nights warmer by trapping the Earth's heat."

Clouds reflect radiation wich results in cooler days and warmer nights.
The question is, what is the total effect (i.e. integrated over 24
hours). The article you cited says, the total effect will be a warmer
climate.

That's reasonable. The point is, airline traffic is of such great
magnitude that it is conceivable that it affects earth's environment.