There is no evidence that 1/3 Gee won’t be fine for humans to live in. NASA has already figured out how to have humans life in zero fee for long periods (low rep, high force exercises).
Mars had enough sunlight to power solar panels and grow plants.
Spinning space stations have their use as well, but have to import 100% of resources. Mars is lousy with water, CO2, and easily accessible elements such as Iron.
It's likely that you feed yourself with hydroponics, and use the waste materials and imported inoculate to start a composting operation, where, like earth gardeners, you feed a little bit of dirt into each batch. If you can tune that to break down perchlorates, then soon you'll have compost you can grow more food in, at which point you start getting compound interest. Assuming, that is, that you send actual soil scientists and not industrial ag people, who think soil is something you wear out and then buy at a store.
On a planetary scale? How?
Just the soil colonists will be using is all you need.
Until then, just rinse off your suit and boots when you enter the dome.