But there are still some areas off limits due to the radiation levels. And as contaminated soil piles up, former residents are wondering when, or if, they will go back. The cleanup work started ...

After 45 years of living in the cool mountain mists of Kaloko Mauka’s Kona Cloud Forest Sanctuary, we have decided to move.

The researchers dug out soil, put it in piles and mixed biochar into half of them. They then set up 24 experimental plots and distributed the soil piles to them in a randomized experiment.