Within the broader picture of sustainability, we know that to have net-positive impact on climate change we must move towards a zero energy and carbon model for the built environment. Our first zero energy project was a simple home over 20 years ago and we have continued to challenge ourselves ever since to find smarter and more cost effective way to make buildings that function as cleanly and elegant as a tree in a forest. Our approach to zero energy and carbon is to work toward optimization of passive design, active systems, and renewable energy. This is a dynamic and iterative process of design, evaluation, and cost analysis.