Re: Bitcoin is now consuming 1% of the world's electricity. Is that sustainable?
bitcoin is sustainable entergetically? my answer is: yes. Based on a research, almost 80% of the energy used to mine bitcoins comes from renewable sources
sources: https://coinshares.co.uk/wp-content/uploads/2018/11/Mining-Whitepaper-Final.pdf (page 9)
You forgot to remove your blinkers
instead of bitcoin mining, this green energy you talk here, could replace some coal power plants for real world electricity needs instead 
its useless, don't try to greenwash bitcoin, it is not sustainable. point.