Living on Earth: YOUNG: The radiation health effects study is one attempt to uncover a hidden price of our energy choices. Economists call these “externalities” — the public health and environmental costs that do not show up in our energy bills. But we do pay for them eventually, one way or another. The National Academy of Sciences, National Research Council has put a number on those hidden energy costs and it’s a big one. Dan Greenbaum was on the Academies’ study panel. He researches air pollution impacts …