Ed Berry, Physicist and Patric Moore, Environmentalist: They both consider that CO2 from human emissions is not causing serious man-made global warming, serious other climate change effects, nor serious rise in ocean levels. In this discussion, they debate which view, logic, reasons are correct for the conclusion that they share about CO2 from human emissions.
Bill Nye the science guy. Will Happer, Emeritus Professor of Physics, Princeton University: “There’s this myth that’s developed around carbon dioxide that it’s a pollutant, but we exhale carbon dioxide with every breath. Each of us emits about two pounds of carbon dioxide a day, so are we polluting the planet?” Happer explained. “The 2016 Paris treaty will not do any good. Anyone who looks at the results of doing what the treaty says can see that the effect on the earth’s climate is — even if you take the alarmist computer models trivial — it will not make any difference and yet it will cause enormous harm to many people.”
Barack Obama, President of the United States: "Few challenges facing America and the world are more urgent than combating climate change. The science is beyond dispute and the facts are clear." "With all due respect Mr. President, that is not true." We, the undersigned scientists, maintain that the case for alarm regarding climate change is grossly overstated.
George Monbiot, author, writer for The Guardian: If our airports are full, there’s an immediate solution. Fly less. The Free Ride campaign has proposed a just means of achieving this: curb demand by taxing frequent flyers, but not those who seldom fly. (In case you’re wondering, I limit my flying to once every three years). But reason has taken flight, the moral compass spins, greed and desire soar towards the stratosphere, and our conscience vanishes in the clouds.
Michael Mann, Professor of Atmospheric Science and Director of the Earth System Science Center at Penn State University. 400 parts per million, what does it mean? It’s the number of molecules of CO2 for every million molecules of air; 400 of them are now CO2. Just two centuries ago, that number was only 280 parts per million. We have to go several million years back in time to find a point in earth’s history where CO2 was as high as it is now. We believe that with that amount of CO2 in the atmosphere, we commit to what can truly be described as dangerous and irreversible changes in our climate.
Michael Mann, Professor of Atmospheric Science and Director of the Earth System Science Center at Penn State University and co-author of The Madhouse Effect: How Climate Change Denial Is Threatening Our Planet, Destroying Our Politics, and Driving Us Crazy. The President of the USA should read the landmark “2020” report now published by Mission 2020, a group of experts convened by the former Executive Secretary of the United Nations Framework Convention on Climate Change. The report establishes a timeline for how we can ensure a safe and stable climate. We don’t have much time — 2020 is a clear turning point.
Paul Driessen, Senior Policy Advisor for the Committee For A Constructive Tomorrow: This recaps testimony by four scientist witnesses at the recent House Science Committee hearings on assumptions, policy implications and scientific principles of climate change. Junk science is being used to justify demands that the United States and world eliminate the carbon-based fuels that provide 80% of the energy that makes modern industry, civilization and living standards possible – and that are needed to lift billions more people out of poverty and disease.
Terry Gross, NPR, David Owen, New Yorker: We're going to start this interview with the subject of David Owen's new book, "Where The Water Goes," about the Colorado River. The river and its tributaries supply water to over 36 million people in seven states - Colorado, Wyoming, Utah, New Mexico, Nevada, Arizona and California - and irrigates close to 6 million acres of farmland. Owen writes about the engineering feats that make all that possible and the legal and environmental battles surrounding the river. The Colorado River is so overtaxed that by the time it reaches the U.S.-Mexico border it's dry. This question can be repeated for rivers and ground water around the world. Each river that is overused destroys the land and water ecology. There are solutions, if we look far enough.