I think you are a bit too pessimistic about it. Bitcoin mining is location invariant and its cost are mainly driven by energy costs, can we agree on that? We should also agree that in certain (many) locations renewable energy sources are the cheapest ones. Based on this you can also see it as an alternative store of value / money that also subsidises renewable energy demand. This drives development of new technologies and efficiency improvements due to economies of scale. Wouldn’t it be nice if you could buy solar panels as cheap as the rasperry pi foundation is able to source its arm processor (where the cheapness is also coming from an orthogonal use case with scale effects)?

Bitcoin has done shit for the environment or for reneweable energy.

I would love to see a real example where you would proof me wrong.

Nonetheless, bitcoin itself is not necssary and it doesn't solve a problem.

People trust currencies. I trust currencies.

Bitcoin also has to have a trust system and right now it is connected to currencies. It is not decoupled. The only thing bitcoin is, its irradical and its basically gambling.

Doesn't this argument imply that the way to stop climate change is to use as much energy as possible in order to subsidize renewable energy production?

If a miner's power source is on the grid, it doesn't really matter all that much if they own a hydro plant, a solar plant, a coal plant, or are just buying power off the market. Either way, they are increasing the total energy consumption of the grid and their environmental footprint is determined by the grid average emissions and the amount of power the miner uses.

If they've built an off-grid renewable power station, you might argue it would otherwise not been built and is therefore relatively neutral, emission-wise. I think that argument would be wrong, because of the scale of large mining operations.

If you can build new renewable energy capacity at a competitive price and at sufficient scale to power a large mining operation, that's one thing and has nothing to do with whether or not you mine crypto with that energy. Deciding to not sell to the grid at that scale seems irrational, and honestly I doubt miners also operate power stations except maybe at a hobbyist level.

> We could design cryptocurrency systems that deliberately focus on using excess renewables

Could we? I thought Ethereum still had a pretty big digital/physical gap. In that there was no way to digitally ensure a physical truth (barring third party attestation).