The new environmentally friendly Eco-haus store in San Francisco celebrated its opening at Greenfest this year, showing off its awesome dual-flush toilet, which uses water from the sink to flush.

“With an average flush of just 1 gallon, Dual Flush toilets reduce water consumption by 40-70 percent. Just imagine the water savings when the water . . . → Read More: Favorite Greenfest 2010 picks