A man and his drone: Carlos Casteneda of the Amazon Basin Conservation Association prepares to launch one of his plastic foam planes. Jason Beaubien/NPR hide caption

itoggle caption Jason Beaubien/NPR

A baby orangutan wearing a diaper swings through the trees at the Sumatran Orangutan Conservation Program outside Medan, capital of Indonesia's North Sumatra province. The program takes mostly orphaned orangutans, nurses them back to health and releases them back into the wild. Anthony Kuhn/NPR hide caption

itoggle caption Anthony Kuhn/NPR

Doughnuts at a Krispy Kreme store in Washington, D.C. An environmental coalition says leading doughnut companies like Krispy Kreme source palm oil from suppliers who are clear-cutting rain forests and destroying wildlife habitat. Meredith Rizzo/NPR hide caption

itoggle caption Meredith Rizzo/NPR

A truck carrying hardwood timber drives along a rural road leading to Paragominas, Brazil, on Sept. 23, 2011. The city has become a pioneering "Green City," a model of sustainability with a new economic approach that has seen illegal deforestation virtually halted. Andre Penner/AP hide caption

itoggle caption Andre Penner/AP

Should our growing understanding of pre-Columbian settlements in the Amazon have any bearing on the debate over the region's development today? Antonio Scorza/AFP/Getty Images hide caption

itoggle caption Antonio Scorza/AFP/Getty Images