Alan Pears is an Australian architect and sustainability expert. He works to help people understand how they can design and build buildings and other structures in ways that use less energy and have less negative impacts on the environment. To do this, he teaches people about renewable energy (energy sources like sun, wind and water that are more gentle on the environment), energy efficiency (designing and operating buildings in ways that use less energy), and how to use green materials (recycled materials, sustainable materials). Alan also helps people think differently about building design, looking at how to make better use of natural elements like sunshine and wind, and how to work with the existing environment when designing new buildings.