Deforestation

The Nazca people of Peru -- famous for their huge line drawings on an arid plateau that are fully visible only from the air -- set the stage for their demise by deforesting the plain, allowing a huge El Niño-fueled flood to ravage the Ica Valley about AD 500, researchers have found. "They died out because they destroyed their natural ecosystem," said archaeologist Alex J. Chepstow-Lusty of the French Institute of Andean Studies in Lima, coauthor of a paper in the current issue of Latin American Antiquity.

U.S. companies could save tens of billions of dollars by investing in efforts to combat deforestation in developing nations instead of cleaning up their own domestic carbon dioxide emissions, according to a report released Wednesday. The report, compiled by a high-powered bipartisan group, backs the use of "forest offsets" in the global effort to curb pollution that is heating up the atmosphere. It was released in advance of the upcoming Senate debate on climate legislation and an international meeting on the issue set for December in Copenhagen.