If articles like this don't convince you that global warming is real, Climate Change Already Affecting America: Government Study, then the fact that our most standard tool for determining if a plant can survive winters in an area ought to.
According to this article Warming Shifts Gardeners' Maps, the hardiness zone maps that gardeners use to determine what will grow in their area has changed since it was last published 18 years ago. This is an example of climate change that affects me personally every time I choose a plant for my location. I can't think of a plainer, more practical, no nonsense way to show the changes in our environment. When plants that never use to be able to survive the winters in your area now can, how can you deny that our climate is warming?
Be sure to move the tab under the map in order to compare the changes.
For those of you who are gardeners you may want to also refer to the American Horticulture Society's Heat Zone Map. Rather than based on winter hardiness it is a guide to heat tolerance. For even more accurate results try their interactive heat zone map based on Zip Codes.
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