Heat from trains moving along tracks in the Parisian metro combined with the warmth generated by human bodies will help heat a public housing project in the city center.
The project, which is based on geothermal technology, aims to draw heat from subterranean passages and move it to heat exchangers before supplying heating pipes.
Carbon dioxide emissions should be slashed by a third compared to using a boiler room connected to district heating.
(READ the story in Reuters)