Earth Day in Photos

Earth Day Challenge, April 25, 2014. Syahrel Azha Hashim/Getty Images
Tons of dead fish float in the Rodrigo de Freitas lagoon beside Corcovado in Rio, March 13, 2013. CHRISTOPHE SIMON/AFP/Getty Images
Radiation testing team returns to the Chernobyl nuclear power plant in 1991, five years after the accident that destroyed the unit 4 reactor. Sovfoto/UIG/Getty Images
Reports indicate that Miami-Dade County could be one of the most susceptible places when it comes to rising water levels due to global warming, 2012. Joe Raedle/Getty Images
Deforestation at the Aka Pygmies In Central African Republic, April 1992. Villagers burn forest to clear land for plantations. Georges Merillon/Gamma-Rapho/Getty Images
Emissions spew out of a large stack at the coal fired Morgantown Generating Station, May 29, 2014 in Newburg, Maryland. Mark Wilson/Getty Images
The Springs fire on May 3, 2013 near Camarillo, Calif. David McNew/Getty Images
The village of Ilulissat near the icebergs that broke off from the Jakobshavn Glacier on July 24, 2013 in Greenland. Joe Raedle/Getty Images
The Alaskan pipeline under the faint glow of the Aurora Borealis, Nov. 19, 2002 near Milne Point, Alaska. Greg A. Syverson/Getty Images
A smoggy day near Tiananmen Square, Oct. 19, 2014. Kevin Frayer/Getty Images
Pump jacks at dawn in an oil field over the Monterey Shale formation where gas and oil extraction using fracking is on the verge of a boom, March 24, 2014, near Lost Hills, Calif. David McNew/Getty Images
Tires, plastic bottles and general rubbish washed up by the sea litter the beaches in Prestwick, Scotland, March, 2005. Christopher Furlong/Getty Images
The coal-fueled Fiddlers Ferry power station emits vapour into the night sky, Nov. 16, 2009 in Warrington, UK. Christopher Furlong/Getty Images
Dark clouds of smoke and fire emerge as oil burns during a controlled fire in the Gulf of Mexico after the sinking, and subsequent massive oil leak from the Deepwater Horizon oil platform. Mass Communication Specialist 2nd Class Justin Stumberg/US Navy
Al Gore attends a session of the World Economic Forum annual meeting on January 21, 2015 in Davos. FABRICE COFFRINI/AFP/Getty Images