International experts have met in London to review the growing problems in the marine environment caused by micro-plastics – tiny pieces of plastic or fibers which may act as a pathway for persistent, bio-accumulating and toxic substances entering the food chain. The experts form a key working group (WG-40) under the Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection (GESAMP), an advisory body that advises the United Nations (UN) system on the scientific aspects of marine environmental protection. The International Maritime Organization (IMO) is the Administrative Secretariat of GESAMP, which has, to date…