What the World Will Look Like 4°C Warmer

For people who think a few degrees of increased world average temperature isn't a big deal, and might even be a good thing, think again:

http://bigthink.com/strange-maps/what-the-world-will-look-like-4degc-warmer

It really drives home the potential impact, but one thing it doesn't mention is that with almost all of Africa and South America becoming desert, we will have lost a major source of the world's oxygen. The entire continental US becoming uninhabitable is a pretty sobering thought.