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About 1/3 apparently https://medium.com/crypto-lucid/buying-a-tesla-in-bitcoins-cancels-4-times-the-co2-savings-for-its-whole-lifetime-c28b042e3b9a https://medi

• gus_massa 6y ago
  The 1/3 assume that the bitcoins are never going to be used again, that is a very bad assumption. Let's be very conservative and assume they will be used once per year for the next 10 years, so instead of the 20+6=26 tons of CO2 you get 20/10+6=8 tons of CO2. (And you get a bigger reduction if you assume more more exchange velocity or that bitcoins will be around for more time.) Also, the 6 tons use the coefficient assume a 1% fee but with a $40,000 transaction, you don't have to pay a $400 fee. Probably $15, but let's be pessimistic and assume $40. So 20/10+6/10=2.6 tons of CO2, i.e. like 1/30 instead of 1/3. (Being more optimistic, I think it can be reduced to 20/100+6/30=.4 tons of CO2, i.e 1/200 of the savings.)