The shocking facts about the scale of plastic pollution choking our seas

Earth Day, which is marked on April 22 every year, has is its origins in the horror at the damage humans were causing to the ocean.

It was started in 1970 by a US senator, Gaylord Nelson, after he witnessed the ravages of the 1969 oil spill in Santa Barbara, California.

Nearly five decades later the human impact on the oceans is reaching crisis point as the explosion in plastic waste is having a devastating impact on marine environments.

The issue captured the public's imagination following th....

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