From the article: bitcoin production emits 20 million metric tons of CO2. Average car emits 4.6 metric tons of CO2. It matters little if some of the electrici

From the article: bitcoin production emits 20 million metric tons of CO2. Average car emits 4.6 metric tons of CO2. It matters little if some of the electricity came from green sources because the energy not consumed by bitcoin production could have been used elsewhere. I have yet to hear about bitcoin production that consumes electricity that would otherwise been gone to waste. For example, using one's nVidia GPUs to heat your house does not count because using electricity for resistive heating is wasteful.