James Hansen : We know what to do to prevent climate catastrophe . But will our descendants thank us ? Ending emissions from coal and stopping development of tar sands are key , he says . Comment: Hansen : It would be unjust to bequeath to our descendants a desolate planet .
James Hansen : We know what to do to prevent climate catastrophe . Ending emissions from coal and stopping development of tar sands are key , he says . Comment: Hansen : It would be unjust to bequeath to our descendants a desolate planet .