Photos: Solar festival as green as it gets

The American Hydrogen Association showed off a converted hydrogen lawnmower.

Hand-powered lawnmowers could be bought around the corner at the Real Goods green household and camping shop, which sells everything from organic cotton bedding to solar-powered hat fans. It was the first store to sell photovoltaic solar panels.

Real Goods is owned by Gaiam corporation, which recently bought the Lime media network as well as the social-networking Web site Zaadz.