Airports are like small towns—at least, they consume as much energy. That’s why it’s always good news when plans are made to make these transport hubs more energy-efficient. The architecture and design firm Foster + Partners took this idea one step further. They unveiled designs for the world’s most sustainable airport in Mexico City. Their single terminal airport will use fewer materials and less energy than a cluster of buildings of a similar size. According to Foster + Partners, the glass building structure “harnesses the power of the sun, collects rainwater, provides shading and directs daylight.” Temperatures in the building will be maintained by innovative methods that are drastically reducing the need for additional heating or cooling. Construction of the new airport will begin in 2015.