This document is a collection of design principles that various individuals and groups have proposed over time to answer that question. Most people stop at 12 principles, and most separate chemistry from engineering as if it were possible to do green chemistry in the absence of engineering. I’ve never found a way to do that and I firmly believe that there are no two disciplines, and no two communities more intimately tied to making the world more sustainable than chemistry and engineering. What you will find on the following pages is an attempt to organize various principles of green chemistry and engineering and present them in a way that helps people to make their chemistry and engineering “greener” and more sustainable. I hope you find this p