Many people won't realize the damage that is cost by wasted resources until it is far too late
We won't be able to stop ourselves from destroying every last resource in the name of greed.
"By November of 2020, itd use more electricity than the entire world does today. Thats bad. It means Bitcoin emits the equivalent of 17.7 million tons of carbon dioxide every year, a big middle finger to Earths climate and anyone who enjoys things like coastlines, forests, and not dying of mosquito-borne diseases. Refracted through a different metaphor, the Bitcoin P2P network is essentially a distributed superintelligence utterly dedicated to generating bitcoins, so of course it wants to convert all the energy (and therefore matter) in the universe into bitcoin. That is literally its job."
(Source: Wired, December 15 2017)
This is just FUD, this is based on assumption on the energy consuption based on current mining equipment and growing difficulty but as you know, the energy efficiency and hash power of mining devices is improving with every new generation. There will be definitely some growth in consumption of energy but it would be very minor compared to this FUD prediction, also the mining of bitcoin is using the most efficient/cheapest energy sources - water, solar so the miners can maximize their profits. You can compare it with gold mining - only portion of gold is used for real pursposes, rest is for store of value but the impact on environment is much bigger - chemicals, energy, waste, landscape destruction. Bitcoin is a gold disruptor, store of value, gold 2.0 with many advantages.