John Elkington is well known for creating the concept of the Triple Bottom Line - People, Planet, Profit, which is a core principle for American Sustainability! His newest book explores his update on the triple bottom line and a twist on the concept of black swans (dramatically unexpected events) to envision green swans - dramatic shifts in innovation leading to a more positive future. This price is for the audiobook edition, or you can use one credit from your membership plan.  This book is also available in hardback for $24.95 and e-book for $9.99.