As University of California physicist John Holdren has said, it is possible that carbon dioxide climate-induced famines could kill as many as a billion people before the year 2020.

John Holdren

John Paul Holdren (born March 1, 1944) is the senior advisor to President Barack Obama on science and technology issues through his roles as Assistant to the President for Science and Technology, Director of the White House Office of Science and Technology Policy, and Co-Chair of the President’s Council of Advisors on Science and Technology (PCAST)

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