I mean, here you go: reusable produce bags for you to bring with you to the store, provided by a corporation.

Yes, milk in glass bottles is more expensive: those bottles are expensive to produce, heavy and delicate to transport, and they need a whole infrastructure to collect and return them to the plant. If we insisted on glass bottles instead of cardboard or plastic, things would be more expensive. The problem is that we, the customers are cheap motherfuckers and will, on aggregate, always go for the cheapest option. So that's what companies offer us. If the government banned single-use plastic or cardboard milk cartons, corporations would shrug their shoulders and offer that: they don't care, they make a profit either way, but as long as plastic is an option, corps know that's what we're going to buy because it's $1 cheaper...so that's what they offer us.

Hell, the majority of the time you’re not even given a choice of what company you get that electricity from.

Yeah, I'd be totally fine with the government finding ways to break up monopolies like this--including natural monopolies, like power and internet (where infrastructure requirements limit competition). Here's the thing, though: if hydro, wind and coal were all options, and coal was 20% cheaper, what would people pick? We're the problem. Luckily, we're getting close to solar being more efficient than any fossil fuel for power (thanks to greedy corporations rushing to develop the tech for sale).

If I’m living paycheck to paycheck, there’s no way in fuck I’m buying solar panels, or collecting and processing my own rain water, or buying the expensive foodstuffs wrapped in the sustainable packaging.

Right. And in a world where those were the only options, you'd eat less food or live in a smaller home. Making them the only options doesn't make them cheaper, and in some cases, where supply is limited, it will dramatically increase prices.

You want to main exactly the same quality of life you have now, make no sacrifices, and for that to somehow be totally green and sustainable. That's not realistic.

Blaming companies is lazy and self-serving. We're the problem. We've always been the problem. Corporations can't make minor adjustments, at no cost or inconvenience to us, and save the planet. That's ridiculous, and it's a self-serving myth, making them a scapegoat for our sins.