Well certainly the formation of Cirrus clouds, which is what mostly happens to stagnant comtrails, will affect the weather in the area of the clouds. Trace amounts of Sulfur are in the exhaust from the jets and should reflect the sun. But I think there is a lot more carbon in the contrail and like all exhaust it hangs around till it is broken down.

I think if you are near a major air hub you should be concerned, just like if you live next to the freeway in southern California. I am not sure what the over all impact of air travel is. I think the auto is a far greater concern right now. That and combustion electrical plants.

Now Maksutov! I am a observer of the fringe. How would that make me a rotten egg? Or were you speaking of the sulfer particle project?

David Davis
Toledo, OR 97391