Commuters’ surplus body heat used to warm office building

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The energy consumers expend dancing can be used to power cellphones and even nightclubs, so why couldn’t the excess body heat of thousands of busy commuters be harnessed in a similar way? Turns out it can — and it is — thanks to Swedish Jernhusen, a real estate company that has devised a way to use just such an energy supply to warm an entire office building.

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