Microsoft responds to accusations that they are selling back door access to their OS, by issuing a vague and obtuse statement, that kind of maybe says that they asked the offenders to stop making the back door’s existence so glaringly obvious.

Yup. But my answer was getting kind of long. There are tons of solution from all over the world. You could write a book on this.

Ground source heat pump operate like earth tubes.

There are all sorts of alternatives. But they are all really expensive, difficult to deploy and tend to be viable only in certain locations. Earthships are one.
https://en.wikipedia.org/wiki/Earthship

I’ve seen some people do closed-loop earth tube systems. But they collect mold and have drainage issues.

Older homes and barns use to have Cupolas or widow’s walks, also historically called a roof walk or captain’s walk. The hot air rises and is vented out the top of the house.

https://www.architerms.com/cupola
https://en.wikipedia.org/wiki/Widow’s_walk

You may hate AC but for some locations and situations it’s the best solution. If not the only solution.

And where do they get the hydrogen???

Fossil fuel… But you really have to dig to find where they admit it.
Last time this came up it was buried in the documentation about how wind and solar don’t provide enough.