Plastic waste could bury Manhattan 3 km deep

WASHINGTON — Industry has made more than 9.1 billion tons of plastic since 1950 and there’s enough left over to bury Manhattan under more than three kilometres of trash, according to a new cradle-to-grave global study.

Plastics don’t break down like other man-made materials, so three-quarters of the stuff ends up as waste in landfills, littered on land and floating in oceans, lakes and rivers, according to the research reported in Wednesday’s journal Science Advances.

“At the current rate, we are really heading toward a plastic planet,” said study lead author Roland Geyer, an industrial ecologist at the University of California, Santa Barbara. “It is something we need to pay attention to.”

The plastics boom started after the Second World War, and now plastics are everywhere. They are used in packaging like plastic bottles and consumer goods like cellphones and refrigerators. They are in pipes and other construction material. They are in cars and clothing, usually as polyester.

Study co-author Jenna Jambeck of the University of Georgia said the world first needs to know how much plastic waste there is worldwide before it can tackle the problem.

They calculated that of the 9.1 billion tons made, nearly seven billion tons are no longer used. Only nine per cent got recycled and another 12 per cent was incinerated, leaving 5.5 billion tons of plastic waste on land and in water.

Using the plastics industry’s own data, Geyer, Jambeck and Kara Lavender Law found that the amount of plastics made and thrown out is accelerating. In 2015, the world created 448 million tons of plastic — more than twice as much as made in 1998.

China makes the most plastic, followed by Europe and North America.