The Larsen B ice shelf, a large floating ice mass on the eastern side of the Antarctic Peninsula, shattered and separated from the continent 10 years ago. A NASA satellite captured the event in this image from Feb. 23, 2002. The 650 foot-thick, 1,250-square-mile ice shelf had existed since the last ice age.
Muslim girls study by candlelight inside a religious school in Noida, near New Delhi, on July 31. The collapse of three regional power grids last week caused a massive power outage that blacked out more than half of India.
Parivatran Sharma/Reuters /Landov
This algae, called Chaetoceros atlanticus, can bloom in the ocean when iron is added to the water. It captures carbon dioxide from the atmosphere and carries the carbon down underwater when it sinks.
Marina Montresor, SZN/Alfred Wegener Institute
Coral polyps feed in the plankton-rich waters by Santa Catalina, Panama. A new study of coral reefs off the Pacific coast of Panama shows that dead coral reefs may be able to recover from rising ocean temperatures and other environmental disasters.
U.N. General Assembly President Nassir Abdulaziz Al-Nasser, United Nations Secretary General Ban Ki-Moon, Brazilian President Dilma Rousseff, Brazil's Secretary of the Conference Luis Figueiredo Machado and Rio+20 Secretary General Sha Zukang attend the closing ceremony of the Conference on Sustainable Development in Rio de Janeiro on Friday.