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 south-east Wales: "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."

He said some 20 million of the scrubbing devices would be required to capture all the CO2 currently produced in the US. ... Read full article