Dr. Michael Mann, Earth System Science Center-Penn State University/The Madhouse Effect: How Climate Change Denial Is Threatening Our Planet, Destroying Our Politics, and Driving Us Crazy, joins Thom. UN secretary general Ban Ki-moon is urging countries to ratify the Paris Climate Agreement during the UN General Assembly in September. But considering the fact that we're seeing more and more climate signals every day - why is the international effort to combat climate change moving so slowly. 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!