Higher estimate of aircraft contribution to global warming

New research suggests that aircraft may make a greater contribution to global warming than previously thought. The findings, amid preparations for a special report by the Intergovernmental Panel on Climate Change (IPCC), may reinforce the EC's resolve to curb aircraft emissions.

Air traffic is expected to double by 2010, leading to significant increases in emissions of carbon dioxide and nitrogen oxides. There is particular concern over NOx emissions because, while aircraft account for less than 3% of anthropogenic releases, at high altitude NOx causes the formation of ozone, a powerful greenhouse gas.

Attempts to quantify aviation's contribution to global warming have been hindered by uncer

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