Next david keith and Clive Hamilton debate the idea of scientifically manipulating the merman to address the threat of Global Warming. This is about an hour. Many thanks scott for that introduction and for the invitation to come and debate climate engineering with david here today. I want to talk a little bit about some of the implication but more about the social and political meaning of what it would mean to have a geoengineered planet and i want to draw on a bit of historical experiencexperienc e to get some idea of what that means. Now david has become the foremost advocate of geoengineering in response to Global Warming and in his new look a case for climate engineering if you put forward an innovative approach to solar geoengineering, that is the use of a fleet of planes to inject sulfuric acid into the upper atmosphere, the stratosphere to create a layer of tiny particles between the sun and the earth and i should point out that today we are going to be talking about this form o