General view of Green For All in Atlanta Earth Day 2012 at Carter G Woodson Elementary School on April 21, 2012 in Atlanta, Georgia.
- [Moses Robinson/AFP/Getty Images]

A view of the rising full moon from the Tonto Plateau in Grand Canyon National Park, Arizona, on April 6, 2012.
- [Daniel DeFraia/GlobalPost]

A member of the organization E-Waste, gathers electronic waste to avoid pollution, on April 19, 2012 in Guatemala City. There are no recycling plants for electronic devices in Guatemala. Activists across the globe will celebrate Earth Day on April 22 with events aimed at bringing awareness of environmental concerns.
- [JOHAN ORDONEZ/AFP/Getty Images]

Volunteers participate in the reforestation of the 'Rosy Walter' zoo, on El Picacho hill, north of Tegucigalpa, on April 18, 2012. Under the slogan 'Your Actions Transform the Planet' and in the framework of the Earth Day next April 22, youngsters in Honduras, Guatemala, El Salvador, Nicaragua and Costa Rica are carrying out different activities to help preserve the environment.
- [Orlando Sierra/AFP/Getty Images]

Hallett Peak from Nymph Lake, Rocky Mountain National Park, Colorado, shot on March 15, 2012.
- [Benjamin Cooper/GlobalPost]

People look at a figure of a Apatosaurio dinosaur made by Mexican artists with 6600 recycled pep bottles, in Mexico City, on April 22, 2012. Activists across the globe are celebrating Earth Day with events aimed at bringing awareness of environmental concerns.
- [YURI CORTEZ/AFP/Getty Images]

Indonesian environmental activists parade during a protest to mark Earth Day in Malang on April 22, 2012. Activists across the globe are celebrating Earth Day on April 22 with events aimed at bringing awareness of environmental concerns.
- [AMAN ROCHMAN/AFP/Getty Images]

Mountains and clouds reflected in Lake McDonald at Glacier National Park in Montana, on May 25, 2011.
- [Daniel DeFraia/GlobalPost]

An Indian worker sprays water onto panels of India's first 1MW canal-top solar power plant at Chandrasan village of Mehsana district, some 45 kms from Ahmedabad on World Earth Day, April 22, 2012. This solar power plant on a 750 metre stretch of the Sanand Branch Canal of Sardar Sarovar Project will generate some 1.6 million units of clean electricity per year and will also prevent evaporation of some 90 lakh litres of water per year from the canal. The project has been developed by the Gujarat State Electricity Corporation Limited (GSECL) and is scheduled to be dedicated by Gujarat state Chief Minister, Narendra Modi on April 24, 2012.
- [SAM PANTHAKY/AFP/Getty Images]