In a recent online question and answer session from the White House, Holdren suggested that man-made global warming is preventing a new ice age. Holdren’s official government title is Assistant to the President for Science and Technology, and he holds degrees from MIT and Stanford. He has taught at Harvard and the University of California, Berkeley.
While the climate of the earth has changed over the millennia as a result of natural factors — principally changes in the tilt and orientation of the earth’s axis and rotation, and in the shape of its orbit around the sun — those changes occur far too gradually to have noticeable effects over a period of mere decades. In their current phases, moreover, they would be gradually cooling the earth — taking us to another ice age…”