SOURCE: The Guardian

DATE: March 12, 2018

SNIP: The number of tiny plastic pieces polluting the world’s oceans is vastly greater than thought, new research indicates.

The work reveals the highest microplastic pollution yet discovered anywhere in the world in a river near Manchester in the UK. It also shows that the major floods in the area in 2015-16 flushed more than 40bn pieces of microplastic into the sea.

The surge of such a vast amount of microplastic from one small river catchment in a single event led the scientists to conclude that the current estimate for the number of particles in the ocean – five trillion – is a major underestimate.

The team analysed sediments in 10 rivers within about 20km of Manchester and all but one of the 40 sites showed microplastic contamination. After the winter floods of 2015-16, they took new samples and found that 70% of the microplastics had been swept away, a total of 43bn particles or 850kg. Of those, about 17bn would float in sea water.

“This is a small to medium sized catchment in the north of England, it is one flood event, it is just one year – there is no way that [5tn global] estimate is right,” said Hurley. The researchers said total microplastic pollution in the world’s oceans “must be far higher”.