This document discusses principles of green building and sustainable architecture. It advocates building in a way that is adapted to the local environment through materials, climate, ecology and practices. Buildings should be designed to last over 100 years rather than just 20, and reuse existing structures where possible. Architecture should be beautiful and evolve local traditions to meet modern challenges through present resources and techniques. Buildings must also fit within the hierarchy and context of surrounding structures. The document quotes Prince Charles expressing concern that sustainability not be viewed as just high-tech but rather draw from local identity, ecology and human scale through natural, locally sourced materials and community-oriented design.