On today's BradCast: An explosive new investigation finds that ExxonMobil knew about the potentially 'catastrophic' dangers of man-made global warming as early as 1977, based on internal company documents and interviews with former Exxon scientists. Instead of warning the world, however, Exxon decided to obscure their own science and sink millions into the climate change denial industry. Neela Banerjee, co-author of Inside Climate News' remarkable investigative report, joins us to explain what Exxon knew and when they knew it, and why the mainstream corporate media has failed to cover the series published by the Pulitzer Prize-winning journalists. Also today: Shell Oil pulls out of their drilling misadventures in the Arctic; NASA announces the discovery of evidence of liquid water on Mars; and Obama and Putin offering conflicting assessments of the disintegrating situation in Syria at the U.N. General Assembly...