The Great Pacific Garbage Patch is an enormous agglomeration of plastic waste floating in the world's largest ocean, but it's not the only one and now scientists are trying to work out how to clean them up. R Reach Penaflor is a man with a mission. Since 2009, he has been working closely with the River Warriors, a group bent on cleaning up estuaries feeding into the Pasig River, which runs through the Philippines' largest urban area, Metro Manila, and is notorious for its noxious smells. Scientists describe the Pasig as the river most responsible for polluting the marine environment.
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