Yes, I have found out the secret of global warming. It is all this snow shovelling. You see moving the snow not causes friction, which melts micro-grains of snow (but imagine all of the thousands of snow shovels moving snow, melting it one little flake at a time). Not only that, but moving the snow exposes darker patches of sidewalk, driveway, and worst of all, blacktop! The snow would normally bounce the sun's rays, but instead the heat of the rays are absorbed into the Earth. We must STOP all this snow shovelling.
More information can be found on this phenomena at: http://www.homehumor.com/shovelling-snow.shtml
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