As my aircraft strategies the Tri-Cities Airport in south-central Washington condition, the sandy expanse outside the house my window gives way to hundreds of dazzling green circles and squares. From this semi-arid terrain springs an irrigated oasis of potatoes, hops, peaches, and sweet corn. Just over and above our look at is a single of the most contaminated areas in the earth: the Hanford Web site, dwelling to 177 getting older tanks of radioactive waste.