This made me appreciate how much a few degrees C of climate change matter: http://xkcd.com/1732/ http://xkcd.com/1732/ When the world climate was 4.3 degrees

This made me appreciate how much a few degrees C of climate change matter: http://xkcd.com/1732/ http://xkcd.com/1732/ When the world climate was 4.3 degrees Celsius colder, Boston was covered under a mile-high sheet of ice.