the mining is getting busier as there's only 4mil coins left, right?
Yes, and because of the price, its difficulty is also soaring up, so you can also add that one in terms of why most miners are 'busy' at this point in time.
I'd actually be more interested in seeing how big of a part green energy is of those statistics...
I'd imagine it could be a lot cheaper to generate your own power with either solar or wind, especially for large-scale mining operations.
It would be cheaper on paper and in the long run, though at first you need to spend a huge amount of money to get those turbines, panels and whatnot installed and maintained before you go fully green on mining power. Also, most electric companies offer a special contract on mining farms I think, that's why most are still staying on regular power.
I really think that in some point in the future, we're really not going to be worrying about power anymore. Once we transition to highly efficient and environmentally-friendly renewables, power consumption might not even be an issue anymore. We're still pretty far off from that, but I do think we'll get there eventually. (If we don't destroy our planet first)
Well, there are already a huge number of prominent people advocating towards greener energy. It's just that most governments can't do shit since they rely heavily on oil and most oil companies would do anything just to stay prominent and be profitable, so yeah, no major advancements for renewables except for a few countries.