Right, the surface of the Earth will eventually become a black body radiator _anyway_, so why should it bother anyone if we want to have a little fun first.
[0] https://www.quantamagazine.org/a-new-thermodynamics-theory-o...
Given the entire argument seems lost on readers given the downvotes it's simple: proof of stake and increased use of crypto both drive down energy cost per transaction. The more people use crypto, the cheaper energy use per transaction assuming currency prices stay the same. (This is lost on most commentators, but it's reasonable to expect price stability in the post-speculation phase of crypto adoption.) And proof of stake and side chains stand to drive those costs down by several orders of magnitude.