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In the second half of the 20th century, the world became, quite literally, a darker place.
Defying expectation and easy explanation, hundreds of instruments around the world recorded a drop in sunshine reaching the surface of Earth, as much as 10 percent from the late 1950's to the early 90's, or 2 percent to 3 percent a decade. In some regions like Asia, the United States and Europe, the drop was even steeper. In Hong Kong, sunlight decreased 37 percent.
Originally posted by Duff Man
What suprised me most were claims that air pollution is clearing up in many parts of the world. I thought we were dumping more crap into the atmosphere than ever! I suppose the worst effects of pollution stay localized.