Plastics in Ocean Decompose After All

Photo courtesy Katsuhiko Saido

For indispensable reporting on the coronavirus crisis, the election, and more, subscribe to the Mother Jones Daily newsletter.


If you thought billions of pounds of indestructible plastic circling the gyres of the ocean was depressing, sorry to say it gets a lot worse. Scientists are now reporting that ” indestructible” plastics decompose with surprising speed and release toxic substances into the water.

The findings were reported today at the 238th National Meeting of the American Chemical Society. Lead researcher Katsuhiko Saido of Nihon University, Japan, and his team found that plastic in the ocean decomposes with exposure to rain, sun, weather, and ocean—giving rise to yet another source of global contamination that will continue far into the future. Their key findings:

  • Polystyrene begins to decompose within one year, releasing components that are detectable in the parts-per-million range. 

  • Plastics themselves usually don’t break down in living animal bodies after being eaten. But the substances released from decomposing plastic are absorbed and could have adverse effects. BPA and PS oligomer can disrupt the functioning of hormones in animals and can seriously affect reproductive systems.

  • The researchers simulated the breakdown of plastic products at low temperatures found in the oceans. Degrading plastic this way created three new compounds not found in nature:  styrene monomer (SM), styrene dimer (SD) and styrene trimer (ST). SM is a known carcinogen and SD and ST are suspected carcinogens.

  • BPA ands PS oligomer are not found naturally either and therefore must have been created through the decomposition of the plastic.

Seems to me we need to reconsider what goes into the ocean with the same urgency we’re almost beginning to exhibit towards the atmosphere.

 

DOES IT FEEL LIKE POLITICS IS AT A BREAKING POINT?

Headshot of Editor in Chief of Mother Jones, Clara Jeffery

It sure feels that way to me, and here at Mother Jones, we’ve been thinking a lot about what journalism needs to do differently, and how we can have the biggest impact.

We kept coming back to one word: corruption. Democracy and the rule of law being undermined by those with wealth and power for their own gain. So we're launching an ambitious Mother Jones Corruption Project to do deep, time-intensive reporting on systemic corruption, and asking the MoJo community to help crowdfund it.

We aim to hire, build a team, and give them the time and space needed to understand how we got here and how we might get out. We want to dig into the forces and decisions that have allowed massive conflicts of interest, influence peddling, and win-at-all-costs politics to flourish.

It's unlike anything we've done, and we have seed funding to get started, but we're looking to raise $500,000 from readers by July when we'll be making key budgeting decisions—and the more resources we have by then, the deeper we can dig. If our plan sounds good to you, please help kickstart it with a tax-deductible donation today.

Thanks for reading—whether or not you can pitch in today, or ever, I'm glad you're with us.

Signed by Clara Jeffery

Clara Jeffery, Editor-in-Chief

payment methods

We Recommend

Latest