Contents

16 March 2007
Vol 315, Issue 5818

About The Cover

Cover image expansion

COVER Sunset along the Graham Coast of the Antarctic Peninsula. In both the Arctic and Antarctica, melting ice and disrupted ecosystems have sounded the alarm on global warming. These regions also offer exciting research opportunities. To ring in the International Polar Year, a special section beginning on page 1513. explores the many dimensions of polar science. Photo: Kim Heacox/Peter Arnold Inc.