We are all trying to go ‘green’: ‘green’ world, ‘green’ city, ‘green’ household. ‘Green’ has become a buzzword for sustainable, safe, energy efficient and/or economic. The Encyclopaedia Britannica describes green architecture as a ‘philosophy of architecture that advocates sustainable energy sources, the conservation of energy, the reuse and safety of building materials, and the siting of a building with consideration of its impact on the environment’.