Ronnen Levinson, a scientist with Lawrence Berkeley National Laboratory, left, shows California Gov. Arnold Schwarzenegger, second from left, a sample from the Cool Colors Project, a roof product that keeps buildings cool, at the exhibit hall at the United Nations World Environment Day 2005 in San Francisco, Wednesday, June 1, 2005. Also pictured are Anessa Begum Mirza, mayor of Ahmedabad, India, second from right, and David Cadman, mayor of Vancouver, British Columbia, Canada, right. (AP Photo/Jeff Chiu) (image used with permission) • story • full-size image (1896 x 1319)