Dr. David Keith is the director of the ISEEE Energy and Environmental Systems Group at hte University of Calgary. He has worked for over two decades on the interface between climate science, energy technology and public policy. He is the winner of MIT's prize for excellence in experimental physics, was listed as one of TIME magazine's "Heroes of the Environment" in 2009, and was named "Environmental Scientist of the Year" in 2006 by Canadian Geographic magazine.
Dr. Keith was featured in Big Think's "Month of Thinking Dangerously" series, contributing the dangerous idea that we should combat climate change by blotting out the sun. He suggested that we should introduce reflective particles into the stratosphere in order to reduce global temperature while continuing to reduce carbon emissions.