Run a car on hydrogen and pure water drips out the tail pipe.

FORBES: Breakthrough in Biofuels? Maybe.

The car doesn't need the carbon dioxide to run, so it sends it out the tail pipe and into the atmosphere.

NPR: Has the Move to Make Cars Greener Stalled?

There are zero tail-pipe emissions for the health-conscious and people felt environmentally and socially responsible while at the wheel.

BBC: Cost overtakes green concerns in electric car debate

The mermaid's intricate tresses, crowned with a garland of flowers, flow back to meet up with her finely wrought fish tail and the pipe's amber stem.

FORBES: Where There's Smoke, There Are Buyers