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Only about 4% of the world's oceans remain undamaged by human activity, according to the first detailed global map of
human impacts on the seas. A study in Science journal says climate change, fishing, pollution and other human factors have
exacted a heavy toll on almost half of the marine waters. Only remote icy areas near the poles are relatively pristine, but
they face threats as ice sheets melt, it warns. [Source: BBC News]
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