Microplastics are a good reason to make sure your plastic makes it to a landfill instead of the ocean more than a reason to give up plastic entirely. Of course, not every country has government provided waste disposal so to the extent that our rich world preferences get foisted onto developing countries by default I guess that is a valid reason to want to reduce plastic use.

But on the third hand locking up hydrocarbons in plastics while we're dealing with global warming seems like a positive good.

From what I understand, most microplastics in the environment are from washing clothing made of synthetic fibers[1] instead of natural products like cotton. It's rare to find something made from 100% cotton - it's usually a blend of mostly synthetic and sometimes natural fibers. Every time you wash them millions of microfiber plastics are released into the sewer system and there is no filter system capable of removing them so they end up permanently in the water cycle. They even end up in rain and snowfall[2], and have been found in organs of the human body[3] and of course wildlife.

> Microplastic pollution caused by washing processes of synthetic textiles has recently been assessed as the main source of primary microplastics in the oceans.

[1]https://www.nature.com/articles/s41598-019-43023-x

[2]https://www.nationalgeographic.com/environment/article/micro...

[3]https://www.theguardian.com/environment/2020/aug/17/micropla...

Rephrased for impact: The dominant source of microplastics is lint.

Fuzzy blanket (synthetic)? Microplastics.

Cozy sweater (synthetic or blend, but lets face it: usually synthetic)? Microplastics.

Microfiber towel? Microplastics.

Plastic straws, bags, and packaging? Landfill.

It is not so rare to find 100% cotton clothing, most websites have an option to filter on the fabric. In physical stores this becomes harder though.

Also landfill becomes like a nuclear waste site, a burden on the future. You can't let it puncture, or be dug up (by humans or animals), or landslip, or flood. You have to cosset the damn thing in perpetuity, or until someone invents plastic-eating fungi (which dump it into the carbon cycle instead).

If we just abandon all landfills for 1000 years with no maintenance, how much of that plastic do you estimate will end up released into the sea during that time? Will it be enough to cause a bigger ecological problem than what's already happened with plastic in the sea today?

Importantly, where did you get your data from? It can't be just your imagination because that's only a tool to reinforce what you already believe.

Modern US landfills are lined and capped water tight, and have been for decades. Permitting is a thoroughly reviewed process, by dozens of federal, state, and local government offices, and hundreds of officials and engineers. Monitoring wells ensure compliance.

Even if it's microplastic in that landfill water, it's not getting to the ocean. Worst case is it's captured with the decomposing gases and condensate, and reprocessed at a refinery or incinerated.

The plastic is much better deposited in US landfills than shipped overseas, where it may be directly spilled into the ocean, or dumped into open fields for the poor to manually sift for the most valuable material, and then there's no telling where the rest of it will end up once it rains.

Plus landfill plastic is sequestered carbon.

Even places that certify plastic recycling into a new end user product are often making worthless items that are given away so that they can claim zero waste. The material ends up as construction fill for hydraulic detention infrastructure, playground surfaces and sports fields, or even those "green" children's toys. Or cheap fleeces. Lots and lots of cheap fleeces, blankets, and snuggies.

The exact places we don't want that plastic to end up.

Right, except that plastics do not biodegrade for hundreds of years or more. Will landfills continue to be as well managed as you claim they are now in perpetuity? Unlikely.

The linings are also non biodegradable, and a solid multi-foot layer of non-permeable clay goes under that. The cap is also non-permeable clay.

The hydraulic conductivity of this clay is measured in millions of years per inch. It's water tight, and it's super absorbent.

Yes, perpetual containment is what they are designed for.

Oil doesn't biodegrade either.

There are microbes that break down hydrocarbons for energy, but they aren't necessary for oil to break down.

Hydrocarbons can break down on their own, which is why you are supposed to change your cars oil every 3 months regardless of how many miles you drive.

Oil is a product of biodegradation, and can be biodegraded by some fungi.

It also degrades in the marine environment.

Eventually, once technology has sufficiently advanced, some people are going to make a lot of money mining landfill for raw materials.

> Our experience with asbestos, another fibre that can penetrate cells, suggests "very bad" is on the list of potentials.

On the other hand, the issue seems to be animals ingest microplastics, mistaking them for food. The thing is, the vast majority of any environment is "not food". Tiny sand particles, dust, lignin, volcanic ash. If there is one thing life is phenomenally good at, it's distinguishing "not food" from food. Introducing a poison like pesticides into the environment, or wholesale environmental change like CO2 is doing - that could and indeed is wiping out a lot of species. But I have a hard time believing another source of "not food" will cause the same scale of damage.

Yeah microplastics might indeed be worse. I didn’t know microplastics potentially had so much in common with asbestos.

>Yeah microplastics might indeed be worse.

Doubtful, not saying it's harmless but microplastics are everywhere, asbestos is not. We should research it but should not jump to the conclusion that it might be worse than a known horrible material.

Asbestos had clear links to various kinds of horrible conditions known all the way back to the early 1900s. Microplastics might increase some kinds of cancer and screw with some hormone signalling but we haven't seen such clear links yet to the same kinds of conditions.

The hunch that asbestos is really bad for human health is very old. The Greek geographer Strabo and the Roman naturalist Pliny the Elder both reported a sickness of the lungs in the slaves who wove asbestos into cloth.

And microplastics are still hydrocarbons that can be broken down into relatively harmless constituents, even if it takes some effort and energy.

Asbestos pretty much stays asbestos forever.