Increased bitcoin price leads, due to the economic equilibrium on which bitcoin rests, to greater energy usage and greater emissions.
Bitcoin already emits as much carbon as the nation of New Zealand. It emits ten times more carbon per year than Tesla, according to their own numbers, have saved over the lifetime of the company.
Increasing the bitcoin price by just 10% will eventually lead to an increase in emissions that will wipe out all of Tesla's environmental gains in a year.