David Whitehouse writes in bbcnews.com that a giant hole appeared in a layer of clouds in Mobile, Alabama, caused by changes in atmospheric temperatures due to global warming. The hole formed when the contrails from a passing plane froze and fell through a cloud, causing the water droplets inside it to evaporate. The warmer lower atmosphere has made the upper atmosphere cooler, which causes contrails to freeze, sometimes crashing to the Earth as mysterious blocks of ice. To see the “sky hole” click here.

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