> the ruinous consequences if a Proof-of-Work-based currency were to rapidly overtake the current payment networks, in terms of the cost of electricity and environmental impact.
The most ridiculous point I've seen by far is the idea that actually, energy is not "wasted", because it's actually generating heat. It is true that computers are 100% efficient space heaters, but that's not the point.
The point is that if you scale the Bitcoin network up, it would put tremendous strain on the energy grid. That's not FUD at all!
Yep we've heard this all before.
Bitcoin vs. Meth Cooking
Bitcoin vs. Yellow Cake Snorting
etc