With the computing power that drives the popular cryptocurrency bitcoin now consuming nearly as much energy as Argentina, analysts are warning the renegade technology’s carbon footprint will only get worse as it becomes more popular.Bitcoin “miners” say those impacts will lessen as utilities shift to renewable energy sources, and their continuing, global quest for the cheapest power for their incredibly electricity-intensive operations gives them their own motivation to shift off fossil fuels. But bitcoin still represents a massive and rapidly-growing source of demand, at a time when grids will be expected to simultaneously shut down fossil fuel generation, build out new renewable sources of power, and meet a wider range of energy needs as space heat and vehicles rapidly electrify.