Photo of a LEED-certified BP petrol station. Its sustainability features include green roofs, solar panels, energy-efficient lighting, and the reuse of the kiosk from the previous petrol station.The newly-built canopy consists of 1,653 stainless steel panels. Project: Helios House Petrol Station, by Office dA and Johnston Marklee; Los Angeles, CA, USA, 2007. Photo: Eric Staudenmaier