September 25, 2014
From The Alberta Tar Sands, one of 29 photos. The top layer of muskeg and earth (right), and the underlying tar sands (left) after the removal of the muskeg, at the Syncrude tar sands operations near Fort McMurray, Alberta, on September 17, 2014. (Reuters/Todd Korol)

From The Alberta Tar Sands, one of 29 photos. The top layer of muskeg and earth (right), and the underlying tar sands (left) after the removal of the muskeg, at the Syncrude tar sands operations near Fort McMurray, Alberta, on September 17, 2014. (Reuters/Todd Korol)

September 4, 2014
From Amazon Warriors Fight for Their Trees, one of 20 photos. A Ka’apor Indian warrior chases a logger who tried to escape after he was captured during a jungle expedition to find and expel loggers from the Alto Turiacu Indian territory, near the Centro do Guilherme municipality in the northeast of Brazil’s Maranhao state in the Amazon basin, on August 7, 2014. Tired of what they say is a lack of sufficient government assistance in keeping loggers off their land, the Ka’apor Indians, who along with four other tribes are the legal inhabitants and caretakers of the territory, have sent their warriors out to expel all loggers they find and set up monitoring camps in the areas that are being illegally exploited. (Reuters/Lunae Parracho)

From Amazon Warriors Fight for Their Trees, one of 20 photos. A Ka’apor Indian warrior chases a logger who tried to escape after he was captured during a jungle expedition to find and expel loggers from the Alto Turiacu Indian territory, near the Centro do Guilherme municipality in the northeast of Brazil’s Maranhao state in the Amazon basin, on August 7, 2014. Tired of what they say is a lack of sufficient government assistance in keeping loggers off their land, the Ka’apor Indians, who along with four other tribes are the legal inhabitants and caretakers of the territory, have sent their warriors out to expel all loggers they find and set up monitoring camps in the areas that are being illegally exploited. (Reuters/Lunae Parracho)

September 3, 2014
From Dramatic Photos of California’s Historic Drought, one of 22 photos. A section of Lake Oroville is seen nearly dry on August 19, 2014 in Oroville, California. As the severe drought in California continues for a third straight year, water levels in the State’s lakes and reservoirs are reaching historic lows. Lake Oroville is currently at 32 percent of its total 3,537,577 acre feet. (Justin Sullivan/Getty Images)

From Dramatic Photos of California’s Historic Drought, one of 22 photos. A section of Lake Oroville is seen nearly dry on August 19, 2014 in Oroville, California. As the severe drought in California continues for a third straight year, water levels in the State’s lakes and reservoirs are reaching historic lows. Lake Oroville is currently at 32 percent of its total 3,537,577 acre feet. (Justin Sullivan/Getty Images)

August 26, 2014
From The Urban Oil Fields of Los Angeles, one of 24 photos. An oil well pumps next to yard containing junked hearses and ambulances near Signal Hill in Long Beach, California, on May 29, 2003. The Signal Hill Oil Field, now known as the Long Beach Oil Field, had the world’s highest oil production per acre by the mid-twentieth century. Hundreds of companies and individuals became rich on minute leases, some locations so close that derrick legs overlapped. New housing and stores are now being built among operating oil wells. (David McNew/Getty Images)

From The Urban Oil Fields of Los Angeles, one of 24 photos. An oil well pumps next to yard containing junked hearses and ambulances near Signal Hill in Long Beach, California, on May 29, 2003. The Signal Hill Oil Field, now known as the Long Beach Oil Field, had the world’s highest oil production per acre by the mid-twentieth century. Hundreds of companies and individuals became rich on minute leases, some locations so close that derrick legs overlapped. New housing and stores are now being built among operating oil wells. (David McNew/Getty Images)

July 14, 2014
From Sustainable Ranching in Colorado, one of 19 photos. Cowboy David Thompson carries the reigns of a horse’s headstall while preparing to gather cattle near Ignacio, Colorado, on June 10, 2014. (Reuters/Lucas Jackson)

From Sustainable Ranching in Colorado, one of 19 photos. Cowboy David Thompson carries the reigns of a horse’s headstall while preparing to gather cattle near Ignacio, Colorado, on June 10, 2014. (Reuters/Lucas Jackson)

June 18, 2014
From Global Coal Usage Reaches 44 Year High, one of 32 photos. A Ukrainian coal miner waits for a bus after finishing his shift at a coal mine outside Donetsk, Ukraine, on May 20, 2014. While coal consumption has dropped in Europe and North America in recent years, it has risen sharply in Asia. (AP Photo/Vadim Ghirda)

From Global Coal Usage Reaches 44 Year High, one of 32 photos. A Ukrainian coal miner waits for a bus after finishing his shift at a coal mine outside Donetsk, Ukraine, on May 20, 2014. While coal consumption has dropped in Europe and North America in recent years, it has risen sharply in Asia. (AP Photo/Vadim Ghirda)

March 27, 2014
From California’s Historic Drought, one of 25 photos. Houseboats are docked at Bridge Bay in Shasta Lake, which is 100 feet (30 meters) below its normal levels, in Shasta, California, on January 23, 2014. Now in its third straight year of drought conditions, California is experiencing its driest year on record, dating back 119 years, and reservoirs throughout the state have very low water levels. (Reuters/Robert Galbraith)

From California’s Historic Drought, one of 25 photos. Houseboats are docked at Bridge Bay in Shasta Lake, which is 100 feet (30 meters) below its normal levels, in Shasta, California, on January 23, 2014. Now in its third straight year of drought conditions, California is experiencing its driest year on record, dating back 119 years, and reservoirs throughout the state have very low water levels. (Reuters/Robert Galbraith)

March 21, 2014
From The First Day of Spring, one of 26 photos. A Palestinian man and his daughter pick wild mustard flowers, which grow in open fields across the Gaza Strip, on March 20, 2014, as the official start of spring was marked by the by the Vernal Equinox. (Mohammed Abed/AFP/Getty Images)

From The First Day of Spring, one of 26 photos. A Palestinian man and his daughter pick wild mustard flowers, which grow in open fields across the Gaza Strip, on March 20, 2014, as the official start of spring was marked by the by the Vernal Equinox. (Mohammed Abed/AFP/Getty Images)

February 17, 2014
From A Frozen Walk to Island Ice Caves, one of 18 photos. Sightseers look at a frozen rock face along the Apostle Islands National Lakeshore of Lake Superior, the world’s largest freshwater lake, near Cornucopia, Wisconsin, on February 14, 2014. According to the National Oceanic and Atmospheric Administration (NOAA) Great Lakes Environmental Research Laboratory, about 94% of Lake Superior is covered with ice, enabling thousands of people to visit the islands on foot for the first time since 2009. (Reuters/Eric Miller)

From A Frozen Walk to Island Ice Caves, one of 18 photos. Sightseers look at a frozen rock face along the Apostle Islands National Lakeshore of Lake Superior, the world’s largest freshwater lake, near Cornucopia, Wisconsin, on February 14, 2014. According to the National Oceanic and Atmospheric Administration (NOAA) Great Lakes Environmental Research Laboratory, about 94% of Lake Superior is covered with ice, enabling thousands of people to visit the islands on foot for the first time since 2009. (Reuters/Eric Miller)

February 14, 2014
From Kelud and Sinabung: Indonesia’s Two Erupting Volcanoes, one of 24 photos. On January 20, 2014, Mount Sinabung spews lava and gas during an eruption viewed from Jeraya, North Sumatra, Indonesia. The volcano has been erupting since September, forcing more than 20,000 people who live around it slopes to flee their homes to several temporary shelters. Earlier today, February 14, 2014, another volcano roared to life in Indonesia: Mount Kelud, spewing ash across most of Java. (AP Photo/Binsar Bakkara)

From Kelud and Sinabung: Indonesia’s Two Erupting Volcanoes, one of 24 photos. On January 20, 2014, Mount Sinabung spews lava and gas during an eruption viewed from Jeraya, North Sumatra, Indonesia. The volcano has been erupting since September, forcing more than 20,000 people who live around it slopes to flee their homes to several temporary shelters. Earlier today, February 14, 2014, another volcano roared to life in Indonesia: Mount Kelud, spewing ash across most of Java. (AP Photo/Binsar Bakkara)

December 13, 2013
From 2013: The Year in Volcanic Activity, one of 36 photos. Mt. Etna, Europe’s most active volcano, spews lava during an eruption as seen from Acireale, near the Sicilian town of Catania, Italy, on November 16, 2013. (AP Photo/Carmelo Imbesi)

From 2013: The Year in Volcanic Activity, one of 36 photos. Mt. Etna, Europe’s most active volcano, spews lava during an eruption as seen from Acireale, near the Sicilian town of Catania, Italy, on November 16, 2013. (AP Photo/Carmelo Imbesi)

November 25, 2013
From The Galapagos of the Indian Ocean, one of 20 photos. Dragon Blood trees, known locally as Dam al-Akhawain, or blood of the two brothers, on Yemen’s Socotra Island, on March 27, 2008. Prized for its red medicinal sap, the Dragon Blood trees are the most striking of 900 plant species on the Socotra islands in the Arabian Sea, 380 km (238 miles) south of mainland Yemen and 80 km west of the Horn of Africa. (Reuters/Khaled Abdullah)

From The Galapagos of the Indian Ocean, one of 20 photos. Dragon Blood trees, known locally as Dam al-Akhawain, or blood of the two brothers, on Yemen’s Socotra Island, on March 27, 2008. Prized for its red medicinal sap, the Dragon Blood trees are the most striking of 900 plant species on the Socotra islands in the Arabian Sea, 380 km (238 miles) south of mainland Yemen and 80 km west of the Horn of Africa. (Reuters/Khaled Abdullah)

October 23, 2013
From Fall Is in the Air, Part II, one of 38 photos. A fallen leaf hangs delicately from a spider web. Original here. (CC BY Jenny Downing)

From Fall Is in the Air, Part II, one of 38 photos. A fallen leaf hangs delicately from a spider web. Original here. (CC BY Jenny Downing)

September 25, 2013
From A Trip to the Galapagos Islands, one of 30 photos. Daniel Orellana of the Charles Darwin Foundation collects seashore imagery with the Street View Trekker at the Los Humedales wetland area on Isabela Island in the Galapagos. (AP Photo/Google)

From A Trip to the Galapagos Islands, one of 30 photos. Daniel Orellana of the Charles Darwin Foundation collects seashore imagery with the Street View Trekker at the Los Humedales wetland area on Isabela Island in the Galapagos. (AP Photo/Google)

July 31, 2013
From Oil Spill Blackens Thai Island Beaches, one of 21 photos. Thai soldiers wearing biohazard suits pass a pail full of spilled crude oil as cleaning operations continue at Ao Prao Beach on Koh Samet, Rayong, on July 31, 2013. An oil spill that has blackened beaches at the Thai holiday island of Koh Samet was having an extreme impact on tourism and could spread to the coast of the mainland and affect the fishing industry, officials and an environmental group said on Tuesday. (Reuters/Athit Perawongmetha)

From Oil Spill Blackens Thai Island Beaches, one of 21 photos. Thai soldiers wearing biohazard suits pass a pail full of spilled crude oil as cleaning operations continue at Ao Prao Beach on Koh Samet, Rayong, on July 31, 2013. An oil spill that has blackened beaches at the Thai holiday island of Koh Samet was having an extreme impact on tourism and could spread to the coast of the mainland and affect the fishing industry, officials and an environmental group said on Tuesday. (Reuters/Athit Perawongmetha)