They are particularly harmful because they end up in your food and cause damage to your organs.

That doesn’t necessarily mean they are all coming from Texas though does it? It could mean ocean currents are carrying them there. I think the idea here is we have maps of ocean currents and can trace them to their likely source.

The nurdles mostly come from the manufacture of Nurgles.

What's worse, a patrol of Nurgles or a patrol of Nargles?

"Evolve" here is a neat word for "countless trillions of creatures die preventable deaths or otherwise fail to reproduce over geological time". If your terminal goal is to "finally stop caring about micro plastics" rather than "protect Earth's existing ecosystem", why wait? Just nuke the planet to glass. Microplastic worry over.

(A similarly nihilist viewpoint comes from the people who pontificate that "the planet will be fine, it's humans who will suffer". Sure, if by "the planet" you mean "a lump of mass orbiting the sun". Low bar for your ethical framework.)

This is such a strange spot for a glass half full take lol. "At least it's warm in hell!"

The trouble with that notion is this: imagining that a plastic-based ecosystem arises (horrifying thought!) it means that there are life-forms capable of deriving energy from plastics, breaking them down. That makes plastics useless to us humans, because any time we try to use plastics for all the things we currently do with them, those life-forms are going to come along and attack, break down the stuff we deem "useful plastics"; the critters will make no distinction between nurdles lost on the beach and the plastics holding your car/house/clothes/aeroplane together. i.e. It's Game Over for plastics use.

Fast forward to that future, someone says: imagine a world where we don't have to live in our own waste ... how much more efficient would our biology be?

I mean sure, with issues like plastics, global warming, ozone layer hole, melted polar caps, extreme weather events, bug collapse, etc etc etc, life will find a way. It's not a "final" extinction event per se, nor one as catastrophic as the meteor strike from back when.

But we are living in a mass extinction event. Billions of crabs died. Bug population has collapsed. Biodiversity has nosedived.

Humanity hasn't suffered yet in terms of total population, but that's because we're able to adapt our environment accordingly. That said, we will see famines and scarcities in our lifetime. Hell, we already do, but it mainly presents itself in day to day life (in "the west") as some products going out of shelves (the UK having supply problems due to brexit / long border queues) or prices spiking (e.g. produce from Ukraine). But worldwide we will see more of that.

As for (micro)plastics, IIRC we've yet to determine the full impact. But we know these nurdles break down into microplastics over time due to UV exposure and the like, but they don't disappear completely and find their way into everything. We'll only know the full impact looking back in a few hundred years.