Right now we are using renewables essentially at capacity, always. Any extra electricity use therefore needs fossil fuels to power it. It's as simple as that.
The AI computation explosion is completely irresponsible and any claims that it can be green are false unless the data centers produce their own solar/nuclear on-site (and even then it's producing tons of waste heat).
Exactly. Why is this so hard to understand? It's about the marignal use. I can't believe anybody who is smart and thought about this for two seconds can make this argument in good faith.