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Estimating the actual energy use of cryptocurrency stuff is hideously complicated... which gives people a lot of room to hide behind excuses like "well actually it's mostly renewables these days" and so on. But yes, it is that bad. Even just considering an estimate for CO2 emissions based on ethereum transactions which directly interact with OpenSea (one NFT marketplace), and ignoring the fact that there must be other transactions involved there by the people interacting with the system and there are other NFT marketplaces etc etc, there's 551,268,013kg CO2 used there alone, or the yearly CO2 output of about ~35,000 US Americans. Or ~78,000 New Zealanders. Or 0.5% of the country of Belgium. And I should stress that this is definitely a low estimate, probably by an order of magnitude if you're looking to estimate NFTs as a whole. Sure, NFTs aren't so bad as to make stopping the impending end-of-the-world scenario impossible while they're being recklessly played with, but they're sure as anything not helping.