The University of Arizona

Southwest Climate Blog

The Southwest Climate Blog, a new feature of the Southwest Climate Change Network Web site, will explore challenges that experts and community members in the region face in trying to understand climate variability and change and make informed decisions.

Posted by Jonathan Overpeck on November 4, 2011

How many of you noticed that the Earth’s human population hit seven billion on October 31, 2011? On Halloween - just a coincidence. We don’t really know the exact moment that we hit...