Sanders is surging. With Iowa and New Hampshire in the bag, Vermont Senator Bernie Sanders has emerged as the clear front-runner in the democratic primary. Reporter Rebecca Leber breaks down his climate plan. Then, Professor Thea Riofrancos explains why the progressive left is rallying behind him as their climate candidate. We also unpack the controversial elements of Bernie’s plan.

Later in the show: while Bernie builds a grassroots movement, two billionaires take a radically different approach to climate action.