Greenpeace founder Patrick Moore says there is no proof global warming is caused by humans, but it is likely enough that the world should turn to nuclear power - a concept tied closely to the underground nuclear testing his former environmental group formed to oppose.
The chemistry of the atmosphere is changing, and there is a high-enough risk that "true believers" like Al Gore are right that world economies need to wean themselves off fossil fuels to reduce greenhouse gases, he said.
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