This is NOT my idea, but it's great so I'll spread it! Imagine a bus with foot pedals by each seat, so passengers, if they want to, can pedal away and have the energy generated be stored in some kind of fuel cell for the bus to use. If a passenger peddles for their whole journey, they get a reduced/free fare. The bus would have selectable electric or 'normal' fuel options, depending on how many passengers have been pedalling to build up the energy stores. I have no idea if the whole concept would be physically/mechanically possible, but it was a great thought when I was told it, so... here I am spreading it!
Actual ideas and inventions that will change the world for the better. (sorry... pretty vague)
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