Among the 2000 delegates who came to Paris in July 2015 to discuss the physical, economic and social aspects of climate change was Kevin Anderson, Professor of Energy and Climate Change at the University of Manchester, UK. He says that we need to immediately begin a drastic scale down of carbon emissions to prevent a collapse of the climate system. This is an in depth interview by Mike Coe, UK, produced in January 2015. Produced by TUC Radio.