Elon Musk shouldn’t hold his breath for bitcoin to become environmentally clean enough to be accepted as payment by Tesla. Tesla said yesterday that it was exiting the cryptocurrency market due to the usage of fossil fuels in bitcoin mining and transactions. He left the door open for Tesla to take bitcoin again if mining the cryptocurrency operates on “more sustainable energy” in the future. However, other analysts warn that renewable energy is not a panacea for bitcoin’s long-term viability.