Why can't it?

The pandemic made a significant positive impact on the environment.

If LLMs can replace certain lines of work (eliminating commutes!), reduce demand for certain consumer goods, and spread the demand for power throughout the day, they could have a huge impact.

I wonder if "reverse anthropogenic global warming" could be a Skynet inducing prompt

Yet another way to avoid thinking about the problem and hoping someone or something else takes care of it.