[rolph]

https://en.wikipedia.org/wiki/Thermoelectric_effect#Seebeck_...

we have this interesting thing called a thermoelectric generator,that converts thermal gradient to electromotive force.

https://scienceimproved.com/how-to-generate-electricity-ther...

so yes harvesting energy from "the heat" is a thing, if you gate the dissipation of heat from the source to a sink.

these are already used to scavenge heat to drive fans, lights, phone chargers, and pumps.

[scoofy]

What “thermal gradient”??? Climate change exists within a greenhouse. We are raising the ambient temperature. Even if you could do something like that at scale (ha!), I’d love to know where your continuous cold sink comes from in an enclosed system.