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The sea star Odontaster validus and sea urchin Sterechinus neumayeri are often found living in association with one another along the Antarctic coastline, here during the Census of Marine Life.
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Sea Stars, Urchins, and Relatives

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An oil drilling platform in oil-free water two years after the Deepwater Horizon oil spill in the Gulf of Mexico.
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Gulf Oil Spill

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On average, Arctic sea ice has decreased by four percent per decade since the late 1970s.
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Sea Level Rise

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two mangrove trees in the crashing waves
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Mangroves

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