but tyson slocumb, director of public citizens energy program says i'm clueless about this. >> i don't think you're clueless, i think we have a minority fringe. the science is settled. john: about what? climate changes, but anything we're going to do about it is going to make a difference? >> absolutely. john: that's not settled. >> absolutely. i mean co2 emissions are a huge variable in determining the earth's clate. and they're up 40% since the revolution. john:y're up, t it not settled that that's going to cause a big problem. >> the science is pretty clear that unless we do something about that concentration of greenhouse gas emissions, we're going to have problems of species extinction, of issues with drought, ocean acidification, reasonable people have a debate about what policy prescriptionstor a clean future and whether clean innovative technologies are in the structure. it is frustrating we continue to debate about climate change, that doesn't excuse irresponsible comments. we need all people to have a civil discourse. john: you agree sometimes the left gets mob like. >> all s