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Wind, solar and hydroelectric systems generate electricity with no associated air pollution emissions. Geothermal and biomass systems emit some air pollutants, through total air emissions are generally much lower than those of coal and natural gas fired power plants.
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The primary limitation of economics, Chetty argues, is that economists have a limited ability to run controlled experiments for theoretical macroeconomic conclusions. The high monetary cost and ethical standards make these types of controlled experiments impractical.
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The Heart of the Civil War Heritage Area is ideally positioned to serve as your "base camp" for driving the popular Civil War Trails and visiting the battlefields and sites of Antietam, Gettysburg, Monocacy, South Mountain, Harpers Ferry, Baltimore and Washington, D.C.
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