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I saw a great article the other day by a climatologist (believe it was posted on this site) that said the sun, which provides all the external heat on earth, is in a decline that will likely lead to a mini ice age. When the sun's energy lowers, it affects the earth's jet stream causing large north/south elliptical sweeps across the planet. These huge swings lead to extremes, such as we now have in the U.S. with California baking and the rest of the country in a deep freeze.
More’s the fool for them to promote Global anything. As it is, it should be ‘LOCAL Warming’ (in CA’s case).