about ecology affect:

You all say btc is a very small part of world energy system, u say that asics and infrastructure linked with it are take a very small affect on  world.
By you forget about localization factor.

What if we take all of mining stuff in the world and place it in one city. You will not be able to breathe in that city I think.
oh of course one city is a tiny part of world, isn't it?