"Green capitalism" only exists if green energy is more profitable than climate-harming alternatives

Given the multiple decades of oil and gas infrastructure, that's not realistic.

In theory, consumer demand for green energy could make this a reality, but it would have to be a massive swing. And in practice, most consumers will go for the cheapest option - in many cases, given their resources, they have to.

The other way that green energy could become more profitable is through heavy government regulation. So... yeah you could have a green 'capitalism' if the State manages the market, and withstands the corporate pressure to withdraw. But that has literally happened nowhere

I suppose hypothetically you could argue that IF a company invested heavily in green technology and IF that investment resulted in a cheaper form of energy, AND that technology also applied to the supply chain, then we could have green capitalism. But i mean that's highly speculative and it also would be entirely a coincidence

No, ethical capitalism is unattainable. The whole point of capitalism is that it rewards greed, so the people at the top of the pyramid will always be the most greedy, and greedy people will always prioritize what makes the most money, not what is right.