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Indians offer prayers on the banks of the River Yamuna, covered in industrial effluence, on Earth Day in New Delhi, India, Tuesday, April 22, 2014. People across the globe hold events to celebrate the Earth's environment and spread awareness on how to conserve its natural resources on Earth Day, observed annually on April 22. (AP Photo /Manish Swarup) ( India Earth Day )

A Greater Adjutant Stork flies by a ragpicker looking for recyclable items at a garbage dump on Earth Day, on the outskirts of Gauhati, India, Tuesday, April 22, 2014. People across the globe hold events to celebrate the Earth's environment and spread awareness on how to conserve its natural resources on Earth Day, observed annually on April 22. (AP Photo/Anupam Nath) ( India Earth Day )

Kashmiri women row a boat filled with weed after cleaning the Dal Lake on Earth Day, on the outskirts of Srinagar, India, Tuesday, April 22, 2014. The weed-clogged Dal Lake is central to Kashmirís tourist trade and efforts are being made to rescue the lake. In the past two decades the lake has shrunk by more than half, according to environmental study reports. (AP Photo/Dar Yasin) ( India Kashmir Earth Day )

Afghan labourers prepare ground for new grass along a roadside in Kabul on April 22, 2014. Afghanistan marks Earth Day on April 22 as the country struggles to stop the long-running process of deforestation caused by increased demand for timber and firewood. Soil erosion caused by deforestation often triggers floods in parts of the country and to cope with the problem, the government plants trees during spring every year - but maintaining them remains a mammoth task. AFP PHOTO/Wakil KOHSAR/AFP/Getty Images ( 529145008 )

A young ragpicker looks for recyclable items at a garbage dump on Earth Day, on the outskirts of Gauhati, India, Tuesday, April 22, 2014. People across the globe hold events to celebrate the Earth's environment and spread awareness on how to conserve its natural resources on Earth Day, observed annually on April 22. (AP Photo/Anupam Nath) ( India Earth Day )

An Indian girl holds a candle during an awareness campaign by Greenpeace activists to save Mahan forest in the Indian state of Madhya Pradesh, on Earth Day in New Delhi, India, Tuesday, April 22, 2014. Greenpeace activists claim that Mahan forest, with villages dependent on its non-timber forest produce, is being threatened with the prospect of coal mining by giant corporations. (AP Photo/Manish Swarup) ( India Earth Day )

Candidates for the Miss Earth 2014 Philippines beauty pageant display Earth Day messages Tuesday, April 22, 2014 by the poolside of a hotel-casino at suburban Pasay city, south of Manila, Philippines. Some 49 candidates are vying for the title of the only beauty pageant with a unique theme of saving Mother Earth. (AP Photo/Bullit Marquez) ( Philippines Miss Earth )

An indian couple stands on the banks of the River Yamuna, covered in industrial effluence, on Earth Day in New Delhi, India, Tuesday, April 22, 2014. People across the globe hold events to celebrate the Earth's environment and spread awareness on how to conserve its natural resources on Earth Day, observed annually on April 22. (AP Photo /Manish Swarup) ( India Earth Day )

A Sri Lankan quarry worker takes a wash in a pool of stagnant rainwater at a stone quarry on Earth Day in Athurugiriya, on the outskirts of Colombo, Sri Lanka, Tuesday, April 22, 2014. (AP Photo/Eranga Jayawardena) ( Sri Lanka Earth Day )

This handout photo provided the Smithsonian's National Zoo, taken May 23, 2011, shows Sumatran tiger Damai at the zoo in Washington. The Smithsonian's National Zoo wants to highlight the dwindling number of 400 Sumatran tigers left in the wild by launching an "endangered song" on Earth Day. On Tuesday, the zoo is releasing "Sumatran Tiger," a song from the indie rock band Portugal. The Man. The song was recorded on 400 polycarbonate records that were designed to degrade after a certain number of plays. The only way to save the song is to digitize and "breed" the music by sharing it through social media. It's is being released to 400 participants to share. (AP Photo/Mehgan Murphy, Smithsonian's National Zoo) ( National Zoo Tigers )

A Greater Adjutant Stork flies by a ragpicker looking for recyclable items at a garbage dump on Earth Day, on the outskirts of Gauhati, India, Tuesday, April 22, 2014. (AP Photo/Anupam Nath) ( India Earth Day )

Villagers cut a Sal tree for firewood at Nagopara forest, about 80 kilometers (50 miles) west of Gauhati, India, Tuesday, April 22, 2014, on Earth Day. (AP Photo/Anupam Nath) ( India Earth Day )

Afghan laborers work on agricultural farmland west of Kabul on April 22, 2014. Afghanistan marks Earth Day on April 22 as the country struggles to stop the long-running process of deforestation caused by increased demand for timber and firewood. Soil erosion caused by deforestation often triggers floods in parts of the country and to cope with the problem, the government plants trees during spring every year - but maintaining them remains a mamoth task. AFP PHOTO/Wakil KohsarWAKIL KOHSAR/AFP/Getty Images ( 529145011 )

Afghan laborers carry squares of turf from a truck to lay along a roadside in Kabul on April 22, 2014. Afghanistan marks Earth Day on April 22 as the country struggles to stop the long-running process of deforestation caused by increased demand for timber and firewood. Soil erosion caused by deforestation often triggers floods in parts of the country and to cope with the problem, the government plants trees during spring every year - but maintaining them remains a mamoth task. AFP PHOTO/Wakil KohsarWAKIL KOHSAR/AFP/Getty Images ( 529144990 )

An Indian man dresses after bathing amidst industrial effluence in the river Yamuna on Earth Day in New Delhi, India, Tuesday, April 22, 2014. (AP Photo /Manish Swarup) ( India Earth Day )

Afghan laborers work on agricultural farmland west of Kabul on April 22, 2014. Afghanistan marks Earth Day on April 22 as the country struggles to stop the long-running process of deforestation caused by increased demand for timber and firewood. Soil erosion caused by deforestation often triggers floods in parts of the country and to cope with the problem, the government plants trees during spring every year - but maintaining them remains a mamoth task. AFP PHOTO/Wakil KohsarWAKIL KOHSAR/AFP/Getty Images ( 529144984 )

A ragpicker girl Zahanara Khatun, 12, looks at the camera as she searches for recyclable items at a garbage dump on Earth Day, on the outskirts of Gauhati, India, Tuesday, April 22, 2014. (AP Photo/Anupam Nath) ( India Earth Day )

Runners run past the "Arch of Peace", visible in background, in Milan, Italy, Tuesday, April 22, 2014. People across the globe hold events to celebrate the Earth's environment and spread awareness on how to conserve its natural resources on Earth Day, observed annually on April 22. (AP Photo/Luca Bruno) ( Italy Earth day )

An Apple employee waits to greet customers at Apple's Fifth Avenue store on Earth Day in Midtown Manhattan on April 22, 2014 in New York City. The store is one of at least 120 Apple stores currently powered by renewable energy. To coincide with Earth Day, Apple announced it's offering free recycling of all of its used products. Apple employees wore green shirts for the occasion. (Photo by John Moore/Getty Images) ( 486084169 )

Apple Genius bar employees assist customers at the company's Fifth Avenue store on Earth Day in Midtown Manhattan on April 22, 2014 in New York City. (Photo by John Moore/Getty Images) ( 486084185 )

An iphone sits on display at Apple's Fifth Avenue store on Earth Day in Midtown Manhattan on April 22, 2014 in New York City. The store is one of at least 120 Apple stores currently powered by renewable energy. To coincide with Earth Day, Apple announced it's offering free recycling of all of its used products. Employees wore green shirts for the occasion. (Photo by John Moore/Getty Images) ( 486084229 )

In this photo taken on Monday, April 21, 2014, West Virginia University senior art student Ben Gazsi works on his Earth Day sculpture of a turtle made from twisted grape vines and stones for the shell at Coopers Rock State Park in Bruceton Mills, W.Va. (AP Photo/The Dominion Post, Ron Rittenhouse) ( West Virginia Daily Life )

The Georgia Ports Authority celebrated Earth Day by unveiling of nearly 14 acres of recently created wetlands around the Garden City Terminal Tuesday, April 22, 2014, in Garden City, Ga. The $3.7 million project treats 100 million gallons of water annually and took 2.5 years to complete. (AP Photo/The Morning News, Avannah Port Wetlands) ( Savannah Port Wetlands )

First-graders at Henderson's Cairo Elementary, as part of a service learning project and Earth Day celebration, place handfuls of dirt around a oak tree they planted at the school Tuesday, April 22, 2014, in Henderson, Ky. (AP Photo/The Gleaner, Mike Lawrence) ( Kentucky Daily Life )

Juan Cedeno, 32, of Miami, holds a handful of plastic fishing line he recovered in rocks along the beach, while volunteering to pick up trash on Earth Day, Tuesday, April 22, 2014, in Miami Beach, Fla. People across the globe held events on Earth Day to celebrate the earth's environment and spread awareness on how to conserve its natural resources. (AP Photo/Lynne Sladky) ( Earth Day Florida )

Amanda Digiovanni, 28, of Miami, displays trash she collected on the beach while volunteering on Earth Day, Tuesday, April 22, 2014, in Miami Beach, Fla. People across the globe held events on Earth Day to celebrate the earth's environment and spread awareness on how to conserve its natural resources. (AP Photo/Lynne Sladky) ( Earth Day Florida )

Camden Mayor Dana Redd, left, and New Jersey Lt. Gov. Kim Guadagno dig holes to plant flowers as part of an Earth Day clean-up effort in Camden, N.J., Tuesday, April 22, 2014. The Earth Day events celebrated on April 22 promote a sustainable and clean environment. (AP Photo/Mel Evans) ( New Jersey Daily Life Earth Day )

A fisherman releases his catch along the James River near downtown Richmond, Va., Tuesday, April 22, 2014. (AP Photo/Steve Helber) ( Earth Day Virginia )

Members of the Sierra Club and other environmental groups hold banners during an Earth Day rally on the beach in Beesleys Point in Upper Township, N.J., Tuesday, April 22, 2014, to protest the proposed pipeline through the pinelands and continued pollution from the BL England power plant, seen in background. (AP Photo/The Press of Atlantic City, Dale Gerhard/) ( Earth Day New Jersey Daily Life )

Maria Caiafa, vacationing from Laurence Harbor, N.J., gathers trash on the beach while volunteering on Earth Day, Tuesday, April 22, 2014, in Miami Beach, Fla. (AP Photo/Lynne Sladky) ( Earth Day Florida )

Ava Simko, 5, sits by a sign she made for an Earth Day program on Public Square, Wilkes-Barre, Pa., Tuesday, April 22, 2014. (AP Photo/The Citizens' Voice, Mark Moran) ( Pennsylvania Daily Life Earth Day )

Cairo Elementary first graders Lyla McChessney and Caleb Sword carry a bag of top soil to use as the first grade class at the school planted a oak tree Tuesday to celebrate Earth Day and as a service learning project, Tuesday, April 22, 2014, in Henderson, Ky. (AP Photo/The Gleaner, Mike Lawrence) ( Kentucky Daily Life )

Volunteer Lauren Landov carries debris from an overgrown empty lot as part of an Earth Day clean-up effort in Camden, N.J., Tuesday, April 22, 2014. The Earth Day events celebrated on April 22 promote a sustainable and clean environment. (AP Photo/Mel Evans) ( New Jersey Daily Life Earth Day )

Matthew Baumann, 7, looks at his painted hand after placing it on a giant paper mache globe at The Building for Kids Children's Museum, Tuesday, April 22, 2014, in Appleton, Wis. Children made handprints to show they were lending a hand to help the earth. According to Gwen Schmitt, education coordinator, along with the globe, there were a variety of stations related to earth conscious activities. (AP Photo/The Post-Crescent, Dan Powers) ( Earth Day )

Students at the Hazleton Area Academy of Sciences in Drums, Pa., along with about 25 students from each of the districtís middle schools participate in an Earth Day program Tuesday, April 22, 2014, in Hazelton, Pa., that included educational and fun activities to help students appreciate the Earth more and to encourage everyone to try to do their part to clean up the planet. Above, students look for trash in the woods around the school. (AP Photo/Hazleton Standard-Speaker, Eric Conover) ( Earth Day )

University of Scranton physics and electrical engineering lab manager Jim Loven shows students an "Off the Grid" solar energy system used to charge a battery and operate an household lamp during Earth Day festivities at the school, Tuesday, Apriul 22, 2014, in Scranton, Pa. From left are: Tyler Mulvihill, of Wilkes Barre; Isabella Dolente, Haddon Heights, NJ; Jim Loven, Chloe Strickland, of Scranton; Jackie Pesavento, Clarks Summit and Caroline Korz, of Havertown. (AP Photo/Scranton Times & Tribune, Michael J. Mullen) ( Earth Day Pennsylvania Daily Life )

Bianca Cortinas pulls a train made of six pack plastic straps during a public demonstration in honor of Earth Day April 22, 2014 at the Globe at Columbus Circle in New York. Designer Tatiana Pages created the train to illustrate a net of garbage to make an environmental statement, take action, inspire creativity and bring awareness to the need for environmental stewardship. AFP PHOTO/Don EMMERT/AFP/Getty Images ( 529156171 )