California Gov. Jerry Brown has signed the nation's first statewide ban on single-use plastic bags. Here, mixed plastic items are seen at a recycling plant in Vernon, Calif., earlier this year.
Gorillas in Virunga National Park in Democratic Republic of Congo, in 2013. Great apes like the gorilla have become increasingly threatened by the expansion of palm oil production in Africa.
Brent Stirton/WWF/Canon/Getty Images
Wheat fields like this one could yield wheat with less zinc and iron in the future if they are exposed to higher levels of CO2, according to the journal Nature.
Volunteer Tom Strain carries debris from an empty lot as part of an Earth Day cleanup effort in Camden, N.J. The Earth Day events celebrated on April 22 promote a sustainable and clean environment.
Police were checking cars throughout Paris on Monday, including near the Arc de Triomphe, as the city tried to cut air pollution by instituting odd-even driving restrictions.
Philippe Wojazer /Reuters /Landov
A tasseled wobbegong shark (top) lies on the seafloor with the head of a brown-banded bamboo shark in its mouth on the fringing reef of Great Keppel Island on Australia's Great Barrier Reef in August 2011.
An animal's ranking on the food chain depends on where its meals place on the ladder. That puts plants on the bottom (they make all their food), polar bears on top and people somewhere between pigs and anchovies.
Lisa Brown for NPR
Saltwater wetlands that include marshes and shoals on Virginia's Atlantic coast. U.S. coastal wetlands losses were 25 percent greater from 2004-2009, according to a recent federal study.
U.S. Fish and Wildlife Service
The Chinese border town of Suifenhe is a port of entry for almost all of the hardwood coming from the Russian Far East. Russia is the world's largest exporter of timber, but illegal logging is a growing problem.
Courtesty of EIA
Former President Bill Clinton hugs House Minority Leader Nancy Pelosi of California as another Democrat, Sen. Barbara Boxer of California, looks on at Wednesday's ceremony naming the Environmental Protection Agency headquarters for him.
Pablo Martinez Monsivais/AP