The scientist who coined the term "global warming" in the 1970s has proposed a radical solution to the problem of climate change.Wallace Broecker advocated millions of "carbon scrubbers" - giant artificial trees to pull CO2 from the air.
Dr Broecker told the Hay literary festival in Powys: "We've got an extremely serious problem."
He added: "It's a race against time and we are just sort of crawling along at a slow pace."
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