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The controversial climate-change contrarian, S. Frederick Singer, a former space scientist and government scientific administrator, who holds PhD in Physics from Princeton University and is co-author of Unstoppable Global Warming: Every 1,500 Years, presents the theory that global temperatures have been rising mostly or entirely because of a natural cycle.

Using historic data from two millennia of recorded history combined with natural physical records, they argue that the 1,500 year natural sunspot magnetic waves cycle that has always controlled the earth's climate remains the driving force in the current warming trend. Man created carbon dioxide has very little effect on the earth's climate.