http://www.sciencemag.org/content/347/6223/768.abstract

Jenna R. Jambeck, Roland Geyer, Chris Wilcox, Theodore R. Siegler,
Miriam Perryman, Anthony Andrady, Ramani Narayan, and Kara Lavender Law
Science 13 February 2015:
Vol. 347 no. 6223 pp. 768-771
DOI: 10.1126/science.1260352

Abstract
Plastic debris in the marine environment is widely documented, but the
quantity of plastic entering the ocean from waste generated on land is
unknown. By linking worldwide data on solid waste, population density,
and economic status, we estimated the mass of land-based plastic waste
entering the ocean. We calculate that 275 million metric tons (MT) of
plastic waste was generated in 192 coastal countries in 2010, with 4.8
to 12.7 million MT entering the ocean. Population size and the quality
of waste management systems largely determine which countries contribute
the greatest mass of uncaptured waste available to become plastic marine
debris. Without waste management infrastructure improvements, the
cumulative quantity of plastic waste available to enter the ocean from
land is predicted to increase by an order of magnitude by 2025.

http://www.sciencemag.org/content/347/6223/768/suppl/DC1

http://www.sciencemag.org/content/suppl/2015/02/11/347.6223.768.DC1/Jambeck.SM.pdf