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Put It on Ice

By Mario Livio

This winter, the continental U.S. has experienced such long periods of cold weather that some have started to wonder whether scientists have somehow gotten the signs wrong, and instead of global warming we are experiencing a mini ice age. This, of course, is not really the case; Europe and the Middle East have actually witnessed a warmer than usual winter. Ice ages are those relatively long time intervals in which the entire Earth experiences significantly colder temperatures, with glaciers covering continental-size regions. Formally speaking, therefore, we are still in an ice age that started about 2.6 million years ago, since …read more

Source: Huffington Post Green