Wrong. You make numerous comments in this thread asserting that the sole focus on this paper is quantifying externalities of crypto mining when that's plainly false. The paper is prescribing policy options for dealing with crypto externalities and birthing new loaded clinical terms to ascribe solely to those externalities: "cryptodamage". Read it.
"As an alternative to intervening in emergent cryptocurrency markets through prices (e.g., taxation) or outright restricting their development, there may be a role for government investment into R&D that focuses on designing mining puzzles that greatly reduce energy consumption (and thus production costs) while still allowing for secure validation of anonymous transactions. Fully vetting and encouraging such currency alternatives might retain the libertarian social benefits of the blockchain [35] while making “the last Bitcoin” irrelevant. Although there will still be private benefits captured from mining under possible low-energy design alternatives, as illustrated here there would be significant public good benefits (reduced cryptodamages) to justify such government investments into R&D. Importantly, such investments in R&D are not mutually exclusive with taxing to internalize cryptodamages, and may also come with the potential to generate spin-off benefits from blockchain technology more generally."