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Clean power from the Earth used to use a lot of water. But a new discovery means that water can be replaced with CO2, which gets left in the ground and doesn't alter the climate

I've tried it all: caulking cracks, blowing in insulation, replacing drafty windows and--I'm especially proud of this one--installing a mail-slot cover so airtight it could be used in a space shuttle docking module . Yet my home heating bill remains an object of fear and loathing