Although nearly everyone fears global warming, images of what life will look like as our climate changes are often disturbingly beautiful. This is a supermassive urban desert dust storm.
And here's an image from Vanity Fair of the rising oceans around New York. Tree Hugger put together a great gallery of what they call "terrifying" global warming images - some real, some photoshopped.
This final image is not touched up in any way. It's a glacier in Patagonia, Argentina - the top image is from 1928 and the second from 2004. Basically this juxtoposed image, put together by Greenpeace, shows that the glacier has melted almost entirely away in less than a century.