Greenhouse shock


Emissions of methane, an important greenhouse gas, may not have been brought under control. Although the rate at which methane concentrations in the atmosphere are increasing has slowed since 1980, Sigrun Karlsdottir and Ivar Isaksen of the University of Oslo in Norway say that this is not because emissions have stabilised. Using a computer model, they have calculated that the change is due to faster breakdown of methane by other pollutants such as carbon monoxide and oxides of nitrogen, particularly over Southeast Asia (Geophysical Research Letters, vol 27,
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