Dr. Michael Mann, Earth System Science Center-Penn State University/Dire Predictions: Understanding Climate Change (2nd edition) joins Thom. Scientists Are Officially Freaked Out By Climate Change! It's a been a weird winter in many parts of America - but nothing compared to the wild winter the Arctic is having. Is this a sign that we've passed or are about to pass another global warming tipping point? For more information on the stories we've covered visit our websites at thomhartmann.com - freespeech.org - and RT.com. You can also watch tonight's show on Hulu - at Hulu.com/THE BIG PICTURE and over at The Big Picture YouTube page. And - be sure to check us out on Facebook and Twitter!

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