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Why build an energy-efficient house? After all, energy prices have been stable for the past five years, so public interest in energy conservation has dropped off. American consumers are demanding bigger houses and faster cars again. Why should you, as a builder, go to the effort of building homes that use less oil, gas, and electricity? According to atmospheric scientists, the best reason to build energy-efficient houses is to forestall a global warming trend. Though fossil fuels have long been implicated in environmental problems from smog and acid rain to oil spills and strip mining, they are now believed to be the primary culprit in a potentially much more farreaching and destructive problem: global warming. Experts have been warning us