Andres Quiroz, an installer for Stellar Solar, carries a solar panel during installation at a home in Encinitas, Calif. Sam Hodgson/Bloomberg via Getty Images hide caption

itoggle caption Sam Hodgson/Bloomberg via Getty Images

The chimneys of the Kolaghat Thermal Power Station loom above a field flooded for rice farming near Mecheda, West Bengal, India, in July 2011. Dibyangshu Sarkar/AFP/Getty Images hide caption

itoggle caption Dibyangshu Sarkar/AFP/Getty Images

This map from the NOAA Environmental Visualization Laboratory shows the amount of heat energy available to Typhoon Haiyan between Oct. 28 and Nov. 3. Darker purple indicates more available energy. Typhoons gain their strength by drawing heat out of the ocean. The path of the storm is marked with the black line in the center of the image. NOAA Environmental Visualization Laboratory hide caption

itoggle caption NOAA Environmental Visualization Laboratory

Orangutans can get exercise and look down their noses at zoo visitors, thanks to cables that stretch from one side of the primate habitat to the other. Karen Bleier/AFP/Getty Images hide caption

itoggle caption Karen Bleier/AFP/Getty Images

A lone emperor penguin makes his rounds, at the edge of an iceberg drift in the Antarctic's Ross Sea in 2006. John Weller/AP hide caption

itoggle caption John Weller/AP