Most of those are reposted by the same account. You just need to ban a few accounts and the feed is clean again.
As someone who does R&D testing on plastics that are used in medical devices, I have some insight. Of course the type of plastic matters, but all plastics use carcinogenic chemicals during the manufacturing/extrusion process.
To make most plastic, a polymer resin is mixed with additives such as solvents, plasticizers, and stabilizers at high temperatures. Ideally, you want the additives to evaporate out during production so that you're left with just the newly formed plastic.
But some of these additives get trapped in tiny air pockets between polymer chains. When they're reheated, the polymer chains relax and release the volatile, carcinogenic additives into the air.
This is likely where the toxicity is coming from, not the polymer chain itself. So regardless of the type of plastic used, reheating the polymer during 3D printing will release some volatile additives.
I still don't get the reasoning behind these sort of geo engineering projects. Let's say, best case scenario, it works wonders and cools the planet significantly.
The fact that we found a "solution" to the warming temperatures will justify the actions if the corporations pumping tons of CO2 and methane into the atmosphere. If anything, it will encourage them to pollute more, as there is now a way to solve the problem.
De-growth is the only way to actually solve the problem. But since it's not profitable, it won't happen under the current economic system.
I honestly believe blocking roads the most effective way to protest in today's society.
It's one of the few ways that's dreamed "illegal" to protest. And most governments will do anything in it's power to clear the roads, including imprison people.
People need to realize that being late to work doesn't actually matter, but the state of the climate does. We need more road blocks. Some without people too, just barricades.
Some people would literally rather nuke the planet than take a train to work...