Bitcoin is an almost perfect exploitation of humanities fatal flaws (greed, unwillingness to acknowledge externalities - i.e. selfishness). It's that old SF-trope that the cause of many of humanity's biggest problems is humans.
The beauty of Bitcoin is that no human can increase supply to address short-term interests, like central banks can. The energy is not wasted. To the contrary, it is used to ensure that the supply is distributed in the prescribed manner and that it is capped. There is no other way of creating a decentralized system that has this feature.