That's we we have the Euro, so we do not need some shady escape path to hypecapitalisms to a currency controlled by only by some people with money who do not care about the environment. I think it is time for governments to monitor and tax the trading of any unregulated currencies above small amounts and particularly raise import taxes to compensate for any CO2 emissions. I have no clue why legislators are so hesitant. IMHO negative effects on the economy would be unnoticeable.