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cooking × 23energy-efficiency × 5
food × 3
water-heating × 3
energy × 2
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home × 2
electricity × 2
gardening × 2
fuel-efficiency × 2
solar-thermal × 2
recycling × 1
solar-power × 1
waste × 1
heating × 1
plastic × 1
greenhouse-gas-emissions × 1
paper × 1
manufacturing × 1
lifestyle × 1
natural-gas × 1
firewood × 1
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safety × 1
cardboard × 1
