Global Warming? Hardiness Map Changes
You've probably seen this map before. It's created by the USDA and shows plant hardiness across North America.
The Arbor Day foundation updated this map based on 2006 weather data from the government and there are some big changes in their new map. In fact, you can see an animation of the map changes on their site. They say the map was "developed the new zones based on the most recent 15 years' data."
Is it Global Warming? Well, we can't say, because it's the United States, and it represents only 16 years of data. But, it is interesting and does seem to prove that significant warming changes have occurred in the U.S. between 1990 and 2005. In fact this is some of the first concrete proof that the warming has occurred in the last decade and it is affecting agriculture.
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