[In a recent issue of National Geographic entitled] Global Warming ... After a decade as Editor in Chief, I have a pretty good idea which articles will provoke a lot of angry letters. Well, we're about to do it again. Why would I publish articles that make people angry enough to stop subscribing? That's easy. These three stories cover subjects that are too important to ignore. This isn't science fiction or a Hollywood movie. But we are going to take you all over the world to show you the hard truth as scientists see it.
— Bill Allen
Global warming