We've heard a lot about climate change - but what can we do about it? Wallace Broecker, the eminent scientist who coined the term global warming way back in 1975, believes in a solution emerging on the horizon: 'artificial trees' designed to remove CO2 directly from the air.

"'Robert Kunzig has an epic saga to tell and he does it with flair and an infectious excitement.'Daily Telegraph 'Part history, part science book, part other-worldly travelogue, this is a magical mystery tour filled with wonders.'Daily Mail 'An exhaustive and enthralling trawl of the ocean floor.' Sunday Times 'Every popular science writer tries to bring new worlds into view; Kunzig's is especially compelling because his new world is so strange, yet so firmly linked to our own.'Guardian"A"A...the presence of a co-writer adds to the charm of the story, for Robert Kunzig seems to have fallen for Mr Broecker and his world. It is easy to see why. (Mr Kunzig) has a lovely appreciation of the poetry of science. Buy this one. Forget the rest.A" The Economist, U.S Edition, 17 May 2008

Wallace S. Broecker is the Newberry Professor of Earth and Environmental Sciences at Columbia University. He was awarded the 2006 Crafoord Prize (the 'Nobel for GeoScience'). Robert Kunzig is a contributing editor on Discover magazine and author of Mapping the Deep, winner of the Royal Society Aventis Science Book of the Year.