Like some way to fill up an empty parking lot at an empty office park or strip mall with portable self-watering containers that contain something like grass or bamboo or de-THC hemp.
No need to re-zone anything, just roll up with it while the land is not being used, soak up some carbon, and then move on if the land gets used again.
[1]https://www.spacefoundation.org/space_technology_hal/sewage-...
> 4th millennium BCE
> Biome: flooded grasslands and savannas
(edit)
Modern agricultural irrigation is draining aquifers.
Aeroponics is a form of hydroponics that uses less water.
Aeroponics: https://en.wikipedia.org/wiki/Aeroponics
"Prehistoric Maize in Southeastern Virginia" (1965) https://www.science.org/doi/10.1126/science.150.3698.881 ; in a marsh
"Archaeological evidence of intensive indigenous farming in Michigan’s Upper Peninsula, USA" (2025) Science https://www.science.org/doi/10.1126/science.ads1643 ; LIDAR identified architectural ridges in forests which would have captured silt when flooded ... citations of: https://scholar.google.com/scholar?cites=1678025822686787882...
"Satellite thermal data applied to landscape archaeology: Mounds in Michigan (1200–1600 CE)" (2026) PNAS https://www.pnas.org/doi/10.1073/pnas.2528379123
Modern day: https://news.ycombinator.com/item?id=45822936 :
- Instream River Training
- LNC Liquid Natural Clay (flood silt in bags)
- River engineering; which beavers used to handle