"They're blaming it all on humans, which is crazy," he said. "We're not the cause of it."
Gray complained that politics and research into global warming have created "almost an industry" that has unfairly frightened the public and overwhelmed dissenting voices.
He said research arguing that humans are causing global warming is "mush" based on unreliable computer models that cannot possibly take into account the hundreds of factors that influence the weather.
Gray said little-understood ocean currents are behind a decades-long warming cycle and disputed assertions that greenhouse gases could raise global temperatures as much as some scientists predict.
"There's no way that doubling CO2 is going to cause that amount of warming," he said.
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