Carbon-capture technology has garnered plenty of attention as a means of halting global warming. But while carbon dioxide has become the bête noire of environmentalists, maybe methane shouldn't be far behind. Indeed, Oliver Boucher and Gerd Folberth from the UK Met Office's Hadley Centre in Exeter argue that methane removal could give "more bang for our environmental buck". But how do you go about getting methane out of the atmosphere? "From a technical point of view it is much more challenging than removing carbon dioxide because of the low concentrations of methane in the atmosphere," says Alexander Sorokin, a chemist at the University of Lyon in France.

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