Climate Change: Why a change of 3, 4 or more degrees is a major problem - Moyers

This is an excellent explanation of temperature increase and the impact for humans.  In Alaska, the water temp has increased by almost 2 degrees in the last 10 years.  We are facing big problems which we need to face.

http://billmoyers.com/episode/preview-why-single-degree-climate-changes-matter/