While studies show young people to be driving less, many of us still aren't going to be doing without cars any time soon. As long as urban developments are built to be un-walkable (we're looking at you, Apple and your new Cupertino Campus), we're going to have to find a way for everyone to be able to get from a to b and back again without destroying the planet. As it stands, the Environmental Defense Fund estimates that a full 20 percent of US greenhouse gas emissions come directly out of our tailpipes.
Fuel efficiency is on the up, albeit rather belatedly, with the most recent data suggesting that carbon dioxide emissions from new cars sold in the UK has declined 31 percent since 2007. But we're invariably better off with the ever improving hybrid electric technologies, and the recent New York Auto Show marked the release of some pretty incredible extended range vehicles. As this technology improves, the cars can only be as green as the grid they draw their power from. It's one thing to steer clear of gasoline, but even better when we can avoid emissions generating fuels altogether.
Similar emissions-reducing advancements are much needed in the aerospace industry. A coordinated project by the biggest manufacturers to develop affordable biofuel technologies for planes is an encouraging move in the right direction, but as we've seen, emissions from agriculture are nothing to get too thrilled about.
That said, the whole not-driving idea is also pretty great when one has the chance. And if you're in an area with exhausting inclines, such as San Francisco, electric bicycles still carry a far lower carbon footprint than many alternatives.