Global warming is an entirely natural phenomenon and its effects can even be beneficial, according to two leading researchers.
Recent climate change is not caused by man-made pollution, but is instead part of a 1,500-year cycle of warming and cooling that has happened for the last million years, say the authors of a controversial study.
Dennis Avery, an environmental economist, and Professor Fred Singer, a physicist, have looked at the work of more than 500 scientists and concluded that it is very doubtful that man-made global warming exists.
They also say that temperature increase is actually a good thing as in the past sudden cool periods have killed twice as many people as warm spells.
Mr Avery, a senior research fellow at the Hudson Institute, an independent US think-tank, said: "Not all of these researchers who doubt man-made climate change would describe themselves as global warming sceptics but the evidence in their studies is there for all to see.
"Two thousand years of published human histories say that the warm periods were good for people.
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