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Weather patterns are shifting, and have shifted many times in the past, and when that happens, we need to adjust. Because it means that things we take for granted may change. The cause is irrelevant, we still need to adjust. During the last Ice Age, much of New Jersey was covered under a mile thick sheet of ice. Is that shift enough for you? The evidence for climate change is all around you, it can be subtle, bees or bats dying of new illnesses, or dramatic, like the decline of the glaciers in Glacier National Park. Glaciers and permafrost melting, habitats shifting, ocean currents changing. The evidence for recent shifts in the past is certainly dramatic, just look at Google Earth, you can still see the canyon of the Hudson, miles out at sea. Or glaciation effects (for example, the Finger Lakes region) Or do you deny that ever happened too? Were the grooves on the rocks in Central Park carved by some crazy environmentalist? External events cause climate changes too. Sometimes meteors hit Earth and cause huge fires, and that causes rapid shift in global climate. Its there in the ice cores and we can see that the shifts in climate come and they are substantial. Sometimes the reasons are impossible for us to discern - thousands of year later. Here's one example.. http://www.sciencedaily.com/releases/2008/06/080619142112.htm The lack of science literacy in the US does not help us economically. We got where we are because of our past leadership in science.