Agreed but I think people should be looking at power companies and how they generate energy for accountability instead of going for industry A and B. Wiping PoW from the face of the earth won’t make those coal plants in China go away.
No, but it will reduce the demand for what they produce. This isn’t hypothetical, even in the US there are examples of coal/natural gas plants getting brought back online for bitcoin mining (finger lakes NY; Hardin, MT)
Free markets are great for a lot of things, but pricing in externalities isn’t one of them.