I agree,but renewable energy production is still very expensive and BTC mining with renewable energy isn't profitable.Maybe after several years,when the new technologies get implemented and renewable energy production becomes cheap and efficient,BTC mining will switch to 100% green energy.
Storage of energy is also far away from the desired level.We need better Li-ion batteries,that will be capable of storing more energy for a longer time frame.
That's true 10 years ago but more companies and innovators are creating more efficient and cheaper renewable energy sources. I think there's this one that makes a wind mill that is cheap and much more efficient than the traditional windmill and it can be place anywhere.