I am aware of the need for carbon removal and (some) desalination, but 1000x-ing our energy production is ludicrous stuff. The waste heat from energy production on that scale would render Earth uninhabitable.
That's incorrect. It's in the order of 25% of the heat reaching the Earth's surface, or maybe 35-40 watts of heat per square metre.
That's roughly ten times the warming effect of doubling CO2.
Now, I don't have a climate model handy to simulate this in detail but I would suggest "render the Earth uninhabitable" is a close enough approximation to the actual effects to suggest it's a terrible idea and anyone seriously proposing it should be laughed out of the room until they've done their homework.
