In recent comments about Bitcoin, Treasury Secretary Janet Yellen says that Bitcoin is a highly inefficient asset that is often involved in illegal activities.  Yellen also says that Bitcoin leaves a massive carbon footprint and isn't being used for transactions on a regular basis.   Yellen's remarks about Bitcoin drove the price down, with Bitcoin trading at just $53,000, after a recent surge in the price that occured last week.  The reason for Yellen's odd remarks about bitcoin seem to center around the fact that the government plans to offer an alternative digital currency to replace #bitcoin.  So, her remarks about bitcoin being dangerous, volatile, illiquid and illicit appear to be driven by ulterior motives.