Global warming caused by aircraft vapor trails?

Don’t let my conspiracy nut poker buddy see this.  Like throwing gasoline on his fire.  Vapor trails supposedly account for 15-20% of warming in the Arctic.  How did they determine this? Why, they built a model that considered “atmospheric composition, cloudiness and the physical properties of emissions, particularly of black carbon.”   Then “These variables were then applied to a grid and aligned with historical data.” And they did all kinds of other sciency neat stuff, too!   ;)

It’s a government conspiracy.  See what is really going on.

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