Bitcoin mining and green energy
bitcoin’s BIG PROBLEM is that it uses a country’s worth of electricity to run the most inefficient payment network in human history. people don’t seem to know this! and i tell them, and they get angry. because a bunch of nerds killing each other for e-pennies is one thing, but that much CO2 is quite another. you could say “it’s their money, they can spend it how they like”, and that’s how things work, sure. but it’s still a massive externality, and this is a big problem.