New USDA plant zones clearly show climate change

Washington Post: Plant hardiness zones, an indicator of the coldest winter temperature, have shifted north and northwest since 1990 around Washington, D.C. (USDA; Patterson Clark and Laris Karklis - The Washington Post) Planting zones are retreating north all over the country, but the United States Department of Agriculture (USDA) won't state the obvious: the shift is a rock solid indicator of climate change. On Wednesday, the USDA released a new plant hardiness zone map, which contours the nation according to......

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