What this planet needs is...more concrete???

No, not really. Concrete uses a lot of energy, so the less the better.

How to build a foundation with only the minimum of concrete?

"Rubble Trench Foundations" can be simple and effective foundations for strawbale.


Various forms of the rubble trench foundation have
been used for thousands of years in construction.

Buildnaturally.com has the step-by-step process of making a rubble trench foundation.