Grass-covered lawns are a subject of frequent derision on TreeHugger, for a variety of reasons. Bonnie notes that they take up space that could be used to grow food, require heavy watering and encourage the use of pesticides.
Having said that, lots of people have lawns- maybe you have one yourself. So if you're not ready to convert your grassy half acre into a working farm, this DIY project to make a solar-powered lawn mower will help you keep things a little greener. And if you want to go even further, click through to the last slide for other ways to reduce your mowing footprint.