Elizabeth Warren actually said...

It is time for our banking system, Madam Chair, as you know, to work as well for everyone as it does for Wall Street.

Many cryptocurrencies are created through proof-of-work mining. It involves using computers to solve useless mathematical puzzles.

About $1 trillion that this thing dropped.

If, for example, Bitcoin--just one of the cryptocurrencies--were a country, it would already be the 33rd largest energy user in the world.