6 Things to know about Global Warming

http://billmoyers.com/2014/06/12/six-things-michael-mann-wants-you-to-know-about-the-science-of-global-warming/

There is nothing controversial about the work of climatologist Michael Mann, director of Penn State’s Earth System Science Center. His innovative research helped recreate the Earth’s historical temperature record and separate the noise of natural weather fluctuations from the steady signal of real climate change. As such, Mann has played a significant role in the development of the overwhelming scientific consensus – the planet is warming and human activities are responsible.