Carbon dioxide builds up whether anyone counts it or not. A litre of fuel can become a number, a number a price, and then using less fuel pays. The gas, the number, the price, the decision, the change: five different things. Full film: youtu.be/nG0bELGEmng

This town already has safe tap water. So what keeps bottled water going? As long as sales cover the costs, the line runs again. Nobody chose it as the best way to give the town water. Full film: youtu.be/nG0bELGEmng

A glass of water from the tap, and the same drink from a bottle. The tap needs a lake, a plant and pipes; the bottle also oil, a factory, trucks, a bin and a landfill. Why does the second system grow beside the first? Full film: youtu.be/nG0bELGEmng