The idea of Air-Ink is a very clever one, taking an approach to reducing pollution that I really like. Rather than using guilt trips or absolution, instead the team at Graviky Inc. have devised a way to make the carbon in car exhausts have a value. It may not be as ideal as simply removing car exhaust pollution, but I think this type of "green" thinking has a much higher change of succeeding. Give a waste product a value and you'll find that scarcity will naturally increase. Definitely a project I'm glad to have discovered.
I am a little disappointed though with the execution. When I first saw the Kickstarter I misunderstood and thought they'd come up with a device you could attach to your car and use the output to syphon off ink. In reality they're just selling the ink, having gathered it themselves and refined it at industrial scale. Don't get me wrong, that's still a great idea, but if they could somehow make the refining process integrated to the capture it would become an amazing idea. Can you imagine driving to work each day and refilling your ink well in the process? Perhaps some people would end up with excess ink, so the next step would be to make printers that could utilise it. Now that's a truly win-win scenario that I would fund in an instant!