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energy-efficiency × 131electricity × 23
heating × 20
energy × 18
water-heating × 14
cooling × 12
home × 10
energy-management × 9
solar-power × 8
fuel-efficiency × 7
air-conditioning × 7
food-storage × 7
electricity-generation × 6
energy-use × 6
food × 5
carbon-footprint × 5
cars × 5
usa × 5
light × 5
cooking × 5
building-physics × 5
environmental-impact × 4
transport × 4
life-cycle-analysis × 4
ecological-footprint × 4