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A new study shows that a typical U.S. home can cut its heating-related climate pollution by 45 percent to 72 percent by swapping out a gas-fired furnace for an efficient, all-electric heat pump.

Most people believe the United States has a power grid that stretches from coast to coast. But the reality is that we have a patchwork of local and regional grids run by many different utilities. The limited “interregional” transmission lines…