He was an advocate of sustainable architecture and wrote extensively on the subject. His books include:
- "The Greening of Architecture: A Guide for the 21st Century"
- "The New Green Home"
- "The Sustainable Home: Living Green in the 21st Century"
- "The Practical Green Building Guide: A Practical Guide for Design, Construction, and Operation"
- "Green Home Improvement: 100 Easy Ways to Make Your Home More Energy Efficient and Environmentally Friendly"
- "The Architecture of Green"
- "Greening by Design: Sustainable Home Architecture for the 21st Century"
- "Design Green: Sustainable Home Architecture for the 21st Century"
- "The Energy-Efficient Home: A Complete Guide to Building and Renovating for Maximum Energy Efficiency"
- "The Green Building Bible: A Complete Guide to Sustainable Design and Construction"
- "The Green Home Construction Handbook: A Complete Guide to Building and Renovating for Energy Efficiency and Sustainability"
- "Sustainable Home Architecture for the 21st Century"