Paul Hawken first wrote this book in 1994. I don’t think any of us need to be told that a lot has changed since then. So, in 2010, he revised the original book to make it more timely. Not sure if what he was saying in the 90s had lost any of its potency, but the newly revised edition brings his philosophy and approach into the here and now. I cannot recommend this book enough if you are looking for answers to questions about sustainability and how we get there from here! Buy it. Read it.