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How will climate change affect the world's oceans? Scientists have barely begun to chart how warming waters will affect marine ecosystems. Now, marine ecologists working off the coast of the Antarctic Peninsula have shown that a sudden 1°C rise in seawater temperature-a change expected to arrive within half a century-drastically alters ocean communities. Species diversity plummeted, and certain creatures, such as tiny, colonial "moss animals," came to dominate the sea floor. [Source: Science / AAAS]
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