Energy consumption of Bitcoin sounds a lot at first glance, but then again if you compare it to the energy consumption of the Eurodollar banking system (data centers in banks, atm network, cost to print money, cash transportation, etc) it is actually not that much for a global digital currency. Also Google and Facebook need huge amounts of energy to run a global network of data centers. Energy is not wasted but this is what makes Bitcoin the most secure cryptocurrency on the planet.