Green roofs mitigate urban heat island effect, control stormwater run-off, reduce sound reflection and transmission, and lower heating and cooling costs, as well as sustain local wildlife. They also look really, really cool.

Instead of discussing the benefits of green roofs, we are celebrating the visual appeal of these sustainable works of architecture from around the world. Included are BIG’s 8 House and TED Cube Building; Renzo Piano’s California Academy of Sciences; the Nanyang Technological University School of Art, Design, and Media; Vector Architects’ Green Technology Showroom; the OUTrial House by Robert Konieczny of KWK Promes; and Zaha Hadid’s Dongdaemun Design Park and Plaza.

As our world becomes more urbanized, and our cities continue to grow, we are replacing the natural environment with buildings, pavement, and asphalt. This causes a phenomenon called urban heat island effect, in which the proximity of urban buildings makes cities several degrees warmer than rural areas. We are starting to realize that we need to counteract this harmful effect and that cooling the roof is one of the best ways of doing so. Many roofing options will accomplish the goal of combating urban heat island effect, including reflective roofs and roof gardens.

As we continue to search for ways to make our homes more energy-efficient, some are finding that reverting to old methods is opening new doors. One such old building practice that is catching on across the nation is straw bale construction.