"The Tipping Point," Bill McKibben's post on climate change, is concise, urgent, and entirely worth reading. It's at:

http://e360.yale.edu/content/feature.msp?id=2012

By the way, the site where McKibben's story appears, called environment360, is an excellent compendium of environmental writing and reporting. It's run by the Yale School of Forestry and Environmental Studies. The home page is at:

http://e360.yale.edu/