Everyone is hopping on board to help keep Copenhagen’s Christmas tree lit. The gorgeous tree is dependent upon passers-by, as it is pedal powered. The tree demonstrates energy efficiency – it’s lit only when people are gathered around to enjoy it. And it’s a statement to say that if everyone pitches in, we’ll be able to transition to a sustainable world. Check out the video of the tree – and its cycling admirers – in action. …Read the full story on TreeHugger