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7 major threats to our planet's oceans

By: Catie Leary on Oct. 16, 2009, 11:22 p.m.

Photo: from eye to pixel/Flickr

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By the start of the 20th century, many species of whales were nearing extinction due to the extreme demand for oil, blubber, meat and baleen. The establishment of the International Whaling Commission in 1946 was a turning point for the endangered giants, but there is still a long way to go.