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> not to mention geopolitical since said ecological effects will be across the border in India

China is taking full advantage of India's military dependence on Russia. (India cannot afford, let alone win, a conflict with China right now.)

There are ecological effects for not doing it too, and in global scale this time. Hydroelectric energy is pretty clean, specially compared with burning oil/coal/gas to make an equivalent amount of energy. At least if the priority is to keep growing and not some massive worldwide degrowth agreement.

This is in a highly geologically active zone though.

Yeah, this article has bit more details https://www.bbc.com/news/articles/crmn127kmr4o