Ocean

Around 90% of all river-borne plastic that ends up in the ocean comes from just 10 rivers

Workers clear garbage at the bank of Yangtze River in Taicang, Jiangsu province, China, December 23, 2016. REUTERS/Stringer ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA. - RC1EC841D900

Asia is responsible for 8 of the rivers that have the most plastic waste. Image: REUTERS/Stringer

Alex Gray
Senior Writer, Formative Content
Share:
Our Impact
What's the World Economic Forum doing to accelerate action on Ocean?
The Big Picture
Explore and monitor how Ocean is affecting economies, industries and global issues
A hand holding a looking glass by a lake
Crowdsource Innovation
Get involved with our crowdsourced digital platform to deliver impact at scale
Stay up to date:

Ocean

Over the last decade we have become increasingly alarmed at the amount of plastic in our oceans.

More than 8 million tons of it ends up in the ocean every year. If we continue to pollute at this rate, there will be more plastic than fish in the ocean by 2050.

But where does all this plastic waste come from?

Some of it is washed into the ocean by rivers. And 88-95% of all river-borne plastic comes from just 10 rivers, according to a study.

Rivers of plastic

By analyzing the waste found in the rivers and surrounding landscape, researchers were able to estimate that just 10 river systems carry between 88 and 99% of the plastic that ends up in the ocean from rivers.

Eight of them are in Asia: the Yangtze; Indus; Yellow; Hai He; Ganges; Pearl; Amur; Mekong; and two in Africa – the Nile and the Niger.

"We were able to demonstrate that there is a definite correlation in this respect," said Dr. Christian Schmidt, one of the authors of the study from the Helmholtz Centre for Environmental Research. "The more waste there is in a catchment area that is not disposed of properly, the more plastic ultimately ends up in the river and takes this route to the sea."

Schmidt and his team found that the quantity of plastic per cubic metre of water was significantly higher in large rivers than in small ones.

Image: Statista

The rivers all had two things in common; a generally high population living in the surrounding region – sometimes into the hundreds of millions – and a less than ideal waste management process.

The Yangtze is Asia’s longest river and also one of world’s most ecologically important rivers. The river basin is home to almost 500 million people (more than one third of China’s population). It is also the biggest carrier of plastic pollution to the ocean.

Recently, however, China has made efforts to curb waste.

For years the country had imported millions of tons of recyclable waste from overseas, but a growing recycling burden at home prompted the government to shift its policy.

Last year, it ended imports of “foreign garbage”. Recently it extended the ban to metals, saying stopping imports of foreign waste was "a symbolic measure for the creation of an ecological civilization in China”.

And this year China has ordered 46 cities to begin sorting waste in order to reach a 35% recycling rate by 2020.

According to the UN Environment Program head Erik Solheim, while China is the biggest producer of plastic waste, it is also making major efforts to curb it.

“If there is one nation changing at the moment more than anyone else, it’s China ... the speed and determination of the government to change is enormous,” said Solheim

The Indian government has vowed to clean up the sacred river Ganges. Image: REUTERS/Rupak De Chowdhuri

The Indus and the Ganges, which flow through India, carry the second and sixth highest amounts of plastic debris to the ocean.

Several years ago, the Indian government launched the Namami Gange project in a bid to clean the Ganges, but recently the National Green Tribunal, India’s dedicated environmental court, said that “not a single drop of the Ganga has been cleaned so far”.

At the United Nations Environment Assembly in December 2017, India along with 193 other nations, signed a resolution to reduce marine plastic waste.

Last year the National Green Tribunal introduced a ban on disposable plastics in Delhi, while non-biodegradable plastic bags are banned in many states.“Halving the plastic input from the catchment areas of these rivers would already be a major success," says Schmidt. "To achieve this, it will be necessary to improve the waste management and raise public awareness for the issue. We hope that our study will make a contribution to a positive development so that the plastic problem in our oceans can be curbed in the long run."

Have you read?

This article has been updated to make clear that the study refers to river-borne plastic only, not overall plastic waste in the ocean.

Don't miss any update on this topic

Create a free account and access your personalized content collection with our latest publications and analyses.

Sign up for free

License and Republishing

World Economic Forum articles may be republished in accordance with the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License, and in accordance with our Terms of Use.

The views expressed in this article are those of the author alone and not the World Economic Forum.

Related topics:
OceanESGInequalityFuture of the Environment
Share:
World Economic Forum logo
Global Agenda

The Agenda Weekly

A weekly update of the most important issues driving the global agenda

Subscribe today

You can unsubscribe at any time using the link in our emails. For more details, review our privacy policy.

These technologies are helping to save our ocean

Johnny Wood

February 26, 2024

About Us

Events

Media

Partners & Members

  • Join Us

Language Editions

Privacy Policy & Terms of Service

© 2024 World Economic Forum