Climate change: What was once south is heading our way (Plant Hardiness Zones)

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From the Louisville Courier-Journal (James Bruggers):

The USDA this past week updated its plant hardiness zone maps, catching up to what many gardeners have known and experienced for a while — our warming climate. The maps show average annual extreme minimum temperatures. While USDA said the map does not confirm any long-term climate change because it’s not based on enough years of data, news reports, bloggers and environmental groups aren’t necessarily buying that.

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