Seems low TBH. Bitcoin is astonishingly, ridiculously inefficient and people's minds just seem to bounce off the numbers because they're so ludicrous. and before you try to say 'well the financial industry also uses a lot of energy', consider that the bitcoin network uses about as much energy as the entire financial industry (the servers, people, offices, everything). One basically runs the world's economy, the other can do 7 transactions a second.