A public housing building in the city is undergoing environmentally friendly renovations and will be heated with the help of activity from the train station below.

A public housing building in Paris is undergoing environmentally friendly renovations and will be heated with the help of activity from the metro train station below. Heat generated from trains and passengers will be channelled up an existing staircase into the structure above.

Planet Ark explains how it works:

The calories emitted by passengers, around 100 watts per person, combined with the heat from trains moving along tracks and the underground location of the metro mean that corridor temperatures are 14-20 degrees Celsius all year around.

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