About three-fourths of U.S. electricity is generated using coal, natural gas, and petroleum.
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Q6: Renewable energy sources account for about 50
Q7: Energy demand is relatively stable over the
Q8: Demographers expect world population to peak and
Q9: Per capita energy use in the United
Q10: A total fertility rate of approximately 1.0
Q12: The United States produces more than twice
Q13: Thomas Malthus argued that increases in living
Q14: Increases in U.S. living standards have matched
Q15: Modernizing economies that have declining birthrates may
Q16: Electricity generating plants with low fixed costs
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