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Indian activists of the People for the Ethical Treatment of Animals (PETA) with bodies painted in green hold placards during a vegetarianism campaign in Hyderabad, India, April 22, 2013.

1 Indian activists of the People for the Ethical Treatment of Animals (PETA) with bodies painted in green hold placards during a vegetarianism campaign in Hyderabad, India, April 22, 2013.

A girl in traditional headwear joins a protest against plans by a private developer for a reclamation project along Manila's Bay, as they celebrate Earth Day on April 21, 2013, in the Philippines.

2 A girl in traditional headwear joins a protest against plans by a private developer for a reclamation project along Manila's Bay, as they celebrate Earth Day on April 21, 2013, in the Philippines.

A volunteer, wearing a disposable cup costume, participates in an environmental campaign as part of Earth Day celebrations in front of Seoul City Hall in Seoul, South Korea, April 22, 2013.

3 A volunteer, wearing a disposable cup costume, participates in an environmental campaign as part of Earth Day celebrations in front of Seoul City Hall in Seoul, South Korea, April 22, 2013.

School children collect rubbish from Karachi's Clifton beach early morning April 22, 2013, during a cleaning campaign as part of the commemoration of Earth Day.

4 School children collect rubbish from Karachi's Clifton beach early morning April 22, 2013, during a cleaning campaign as part of the commemoration of Earth Day.