Access

News and Views

Nature Geoscience 2, 243–244 (1 April 2009) | doi:10.1038/ngeo486

Atmospheric science: Clean air policy and Arctic warming

Noel Keenlyside

The Earth has become a much warmer place during the past 30 years. The largest surface temperature warming was found over land and the Northern Hemisphere, particularly over the mid- to high-latitudes (Fig.