[abakker]

It is worth noting that not all crops absorb toxic metals in the soil, and some crops/plants sequester certain metals extremely well - (Kale/Thorium, Garlic/Selenium). Possibly we could use certain crops to ameliorate certain metal toxins.

[haZard_OS]

We already do. It's called phytoremediation. Some of us even make a pretty decent living specializing in the field.