Global Warming?

The 12-month period from May 2011 to April 2012 was the hottest recorded in U.S. history. Note that the carbon dioxide levels in the atmosphere also reached 391 parts per million, the highest in 800,000 years. Cause and effect? Could be. Meanwhile as of May 8, the Republican controlled House had passed 209 anti-environment bills, the most in US history. Maybe they don't understand science.