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I found a coin claiming to do this - tradeable carbon credits, where you could extinguish a coin to offset carbon. It seemed like it had no traction.

You could make carbon-neutral coin that automatically offsets its own emissions by buying and extinguishing carbon offsets for every transaction. Obviously this would be cost-prohibitive for Bitcoin, but seems practical for less energy-intensive cryptos. I’m surprised nobody has done this (at least, I didn’t find it by googling). I think you could make billions of dollars off this because of the current furor over environment impact of cryptos. And it would actually be good for the world.