Imagine a bike that has been made from plant-based materials or reused and recy cled parts. Imagine that the material wearing from your tyres or brake pads is biodegradable. That the lubricant washing down from your chain no longer pollutes the forest you are riding through, but provides valuable nutrients for the plants in it.

You no longer discard your old bike as if it were a piece of rubbish, but return it to the manufacturer so that parts and materials can be reused to make new bikes. Or...