@Birdy, You're completely right.Global warming is something real, I cannot deny that. I just don't think we will notice any effect in our lifetime.
The funny thing here is that all the comps crunching BTC will only account for 0.000001%(give or take some) of all energy consumption worldwide. . I don't think BTC is using more energy than an average banking corp.
I also think there is too much worry about the CO2 emissions and too less about the stuff that is really important right now (e.g. too much fishing, fish populations are collapsing right now)