The 2011 Solar Decathlon is heating up as 20 teams of students from around the world construct stunning, energy-efficient homes at the National Mall’s West Potomac Park in Washington, D.C. The competition officially opens on September 23rd, but Inhabitat offers a first look at each of this year's solar-powered homes. — Inhabitat

The founder of Passivhaus and director of Passivhaus Institute PHI, Dr. Wolfgang Fiest, has just sent word that the Passive House Institute United States (PHIUS) will no longer be able to provide building certifications, and will no longer be considered a partner of the program. — Inhabitat

Renzo Piano recently unveiled plans for a new waterfront cultural center and urban park in Athens that includes a massive opera house and a library that is directly connected to the park by a sloping green roof. The Stavros Niarchos Foundation Cultural Center will also incorporate several sustainable technologies with the hope of attaining LEED Platinum certification. — Inhabitat

Diawa Lease just sent Inhabitat the first photos of their new transforming EDV-1 shelter, which can be set on any terrain, doubles in size with the flick of a switch, and can sustain itself without any outside resources for up to a month by catching and reusing water and generating electricity with a huge built-in solar array. —