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While scientists the world over continue to study and debate what part man has played (if any) in the gentle warming that took place mainly in the latter half of the last century, Dr. James Hansen is absolutely certain. The purpose of his book is to scare us into taking immediate and drastic action to control greenhouse gases, mainly carbon dioxide. Although Dr. Hansen is a scientist, his work is more political than scientific. He makes an emotional appeal and he does it by attempting to build fear that there will be no world left for our grandchildren to live in.