FILE - In this July 7, 1997, file photo, American millionaire Douglas Tompkins, left, and Juan Villarzu, chief of staff of the Chilean president, hold the text of an accord signed in Santiago. Officials in Chile said Tuesday, Dec. 8, 2015, that Tompkins died from severe hypothermia in a kayaking accident. (AP Photo/Santiago Llanquin, File)
SANTIAGO, Chile – Douglas Tompkins, a wealthy U.S. businessman and environmental activist who bought up large swaths of land in South America's Patagonia region with the aim to keep them pristine, has died. He was 72.