The current buzzword in the world of environmentalism is "offset." Many, if not most of us, are concerned about the environment, and while the recent exponential increase in coverage of topics like global warming has spurred some change on the part of consumers, a lot of people still aren't willing to risk even the tiniest amount of comfort, in order to help impede the seemingly inevitable collapse of the world around them.

The idea behind offsetting is that, while at present, it's almost impossible to lead a zero-emission lifestyle and still be a functioning member of modern society, there are certain actions that we can take to help minimize our harmful contributions to our environment.

Green roofs are one such idea. While those of us living in big cities don't get to reap the benefits of backyards, planting a lawn and garden atop the roof of your apartment building can do a touch to help soak up some of the harmful quantities of carbon and pollution that we emit on a regular basis.

Zhishai, a taxi driver in Bejing, decided to bring the solution closer to the source of the problem, by planting a mini green roof atop his cab. I don't see the green roof eclipsing the sunroof as a top aftermarket add-on, especially for those among us who are regular highway drivers, but Zhishai has no doubt become a legend amongst the local pigeon population.