- To Speak for the Trees: My Life's Journey from Ancient Celtic Wisdom to a Healing Vision of the Forest
- The Global Forest
- The Sweetness of a Simple Life: Tips for Healthier, Happier and Kinder Living Gleaned from the Wisdom and Science of Nature
- A Garden for Life: The Natural Approach to Designing, Planting, and Maintaining a North Temperate Garden
- Our Green Heart: The Soul and Science of Forests