There’s the old climate war, the one where fossil fuel interests put all their efforts into denying there’s a problem. And then there’s the new one. Denial isn’t  working anymore says Dr. Michael E. Mann. He’s the director of the  Earth System Science Center at Penn State. He says the new climate war deploys ‘inactivists” who block efforts to wean the world off fossil fuels.  Dr Mann tells us what can be done about these new tactics and why he’s optimistic about saving the planet.