Not only is global warming a real and present threat that may yet in conjunction with impending energy shortages doom industrial civilization, it may have even been dangerously underestimated. “What have you been smoking!?,” you might say to me. Get off the doom train and enjoy the Sun. Unfortunately, we might not have much of it during the next decades – at least metaphorically speaking. To see why, I recommend you watch this video on global dimming or read its transcript.
So here’s the plot-line. After 9/11, the US air fleet was grounded for three days in the name of national security. Though presumably a major inconvenience for travelers, it was a boon for climatologist David Travis who was studying the effects of contrails, or vapor trails, left behind by high-flying aircraft on the world’s climate.
He predicted that removing contrails would have a significant impact on global temperatures, but was shocked to discover that the daily temperature range – the difference between the hottest and coldest temperature measures in a day – shifted up by an unprecedented 1.1C during those three days!