To embed, copy and paste the code into your website or blog: Crypto currency continues to be debated – some believe in it; others do not. The decision by the founder of Tesla to exit the market recently seems to have added a new element, however. Now the question is if crypto is energy efficient. Crypto mining does in fact require a great deal of energy. One solution recently offered is to do the mining at the foot of a dam in China that apparently generates a great deal of environmentally friendly energy since it comes from hydro power, according to a news report. Absent that option, the environmental question may be a challenge.