It's not explicitly a great argument, but it's an excellent premise to set.
Because this whole thing has absolutely nothing to do with pollution or water. It has to do with people hating AI and looking to portray it negatively. The proof is that if they actually cared, there's a million better places to put their efforts into.
It is not an honest issue and it deserves no attention. The vast, vast majority of people talking about how terrible this is for the environment deserve to be ignored first, scorned later.
There aren't a million better places to put efforts into. This is a good place to put effort into stopping because it isn't yet entrenched, and you stop the other negative effects besides just the pollution and water use, and you can build a coalition with the people against the other negative effects of AI.
Bob: "I hate <company> and what they're doing to this cute fluffy animal I would like to do things to stop that"
Tom: "Well actually they're not nearly as bad as <other company> to said fluffy creature and if you actually cared about fluffy creature you'd only focus on them"
Great argument. Hate to be the one to tell you this but, two things can be true at once.
This is 100% true. Every person I know - and I know a lot of them because I'm one of them myself - who already seriously cared about the environment pre-AI, including making personal sacrifices for it, doesn't place outsized importance on AI's environmental impact compared to other sources. Every person who frequently brings up AI's environmental damage are those who honestly never really cared about the environment/climate, at most paying lip service to it for brownie points/to feel better but never took any actions that would inconvenience themselves.
Because we who actually care about this subject go through the effort of educating ourselves and tend to use our energy in ways that actually make a difference, that are effective. Because we care about making an impact, not about brownie points.
People are just embarrassed to admit they're scared they might lose their job. They shouldn't be but they are because they've attached their identity to their career and to the concept of it making them uniquely skilled and creative, in a way that a machine could never replace.
Please don't take this as saying they are replaceable by AI. Maybe it never will. That doesn't matter, what matters is that they're scared that it will, and they're too embarrassed to admit they're scared of it, so they point towards the environmental damage.