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.