contrails and 9/11

[Melbourne]

Are jet contrails the latest threat?

Is it true that after Sept. 11 2001, the USA had bright clear skies because the passenger jets were grounded?

[GreysonCarlisle]

Here’s an article from Nature that explores the climate effects of the 9/11 grounding.

Absent contrails were never assumed to be the sole cause of the large temperature ranges, he emphasizes. “We’ve always said it’s a combination of the lack of airplanes and the natural weather conditions,” he says.

[Uncle_Jocko]

We had bright clear skies on September 11, too, before the planes were grounded.