This 2008 photo provided by NOAA Pacific Islands Fisheries Science Center shows debris in Hanauma Bay, Hawaii. A study released by the Proceedings of the National Academy of Sciences on Monday, June 30, 2014, estimated the total amount of floating plastic debris in open ocean at 7,000 to 35,000 tons. The results of the study showed fewer very small pieces than expected. (AP Photo/NOAA Pacific Islands Fisheries Science Center)
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