The amount of energy being used to power Christmas lights has been a major topic this season, but in Geneva there are Christmas trees will only be lit when you pedal.
The trees on the Place du Rhône are linked to several static bikes equipped with a generator.
If passers-by want to see the lights, they have to work for it.
The trees have been installed by the city and is designed to highlight the importance of energy.
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This winter was significantly warmer than average
