Dr. Hansen is well-qualified to speak on the subject of global warming and in this lecture describes the underlying principles and evidence for the changes we now observe. He also makes predictions for the future against the accuracy of prediction he has made over the past several decades, all of which are now fact or on the predicted track. Dr. Hansen is the target of attacks about his views of a proposed economic method to reduce carbon emissions and about his claim that NASA tried to muzzle his alarm about climate change.

Here is his talk March 10, 2012.

James E. Hansen was born March 29, 1941. He is an adjunct professor in the Department of Earth and Environmental Sciences at Columbia University. B.A. in Physics and Mathematics with highest distinction in 1963, M.S. in Astronomy in 1965, and a Ph.D. in Physics, in 1967, all three degrees from the University of Iowa. He has been head of the NASA Goddard Institute for Space Studies in New York City, a part of the Goddard Space Flight Center since 1981.