The episode is set at the Macallen Building, Boston's first LEED-certified condominium building and a large-scale example of sustainable design. In Austin, Texas, host Kevin O'Connor visits SOL Austin, a subdivision where neighbors aspire to net-zero energy use. At the International Builders' Show in Las Vegas, Nev., licensed contractor and host Amy Matthews discovers a plaster from Germany that actually cleans indoor air. In Burlington, Mass., Kevin visits one of the leading makers of light-emitting diode (LED) lights to see what's in store as incandescent bulbs are phased out. Kevin sees an industrial-scale green roof as well as systems for putting one on any house and Amy sees how rainwater harvesting can add up to real savings. In Richmond, Calif., Amy observes how tons of recycled glass are transformed into Vetrazzo countertops.