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I'm sorry, what applications? Besides accelerating global warming there doesn't seem to be anything it's good at.
Please look at this data and then come back and tell me you still think Bitcoin mining is having a meaningful impact on climate change and why. https://cbeci.org/index/comparisons I'd be curious to read your thoughts.
That's absolutely nuts. If you said you could reduce an entire country's CO2 emissions to zero overnight, and you had a valid plan to do so, you'd be on the cover of every newspaper for your revolutionary plan to help save the earth.
But say you want to flip a switch and turn off a single cryptocurrency in order to do it, and you'll have floods of people trivializing it, saying "well, let me tell you why 110 million people's CO2 emissions aren't that big of a deal..."