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To save the planet, mankind must rapidly reduce its greenhouse gas emissions. But where should we be reducing those emissions from? What would make the biggest difference? Journalists and environmentalists often answer that question by looking at which sectors of the U.S. economy contribute the most to global warming. Transportation (cars, buses, trucks, and planes) leads in greenhouse gas emissions, while electricity (coal and natural-gas power plants) is a close second. Industrial goods and services are third; buildings, fourth; and agriculture, fifth. This way of measuring blame, however, misses something crucial: people. T hese industries are spouting carbon because customers demand t... Full story

15 June