In a lot of residential areas, roads are impassable, … There are just so many thousands of trees down. It’s hard to even describe, it’s so immense.

I think what we’ve shown are that contrails are capable of affecting temperatures. Which direction, in terms of net heating or cooling, is still up in the air.

Contrails are denser and block sunlight much more than natural cirrus clouds.

We studied the change in temperature range that occurred during the three-day period immediately following the 9/11 terror attacks when airplanes were grounded and compared those to the three-day period immediately before and afterwards.

We are currently finishing up research that is looking at the causes of increases in jet contrail coverage beyond simply increased number of flights. These results are currently in review and will hopefully be published...