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The massive clean-up needed at nuclear power plants such as Hanford is discussed in Innovators: Cleaning Up, as scientists and officials debate the best methods for removing toxic waste from the sites. Contamination has leached into the soil, and has made the land unsafe for human habitation. The problem of radioactive waste is challenging, and guest commentators give their opinions regarding ways to deal with the removal of these materials. The program also looks at an international effort to construct a fusion reactor to provide power, with major nations sharing in the cost.