Aerial view of deforestation

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Protest against overfishing in harbor

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anti-BP protest art

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Climate change protest on beach

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Pink river in Brazil

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Amazon rainforest from space

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Flooded forest in the Amazon

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Protest against Vietnam War

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Mario Savio quote on protest

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Red river in Brazil

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Red River of Brazil

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SpongeBob oil spill protest

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Polar bear in urban alley

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Protesters with ironic banner

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Protesters with 'Save the Planet' banner

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Anonymous activist poster

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Global warming graffiti on flooded wall

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Anonymous: Expect Us

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Lady Gaga at equality march

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Protesters with 'Save the Planet' banner

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