Publication of this eBook, incorporating 35 chapters, was timed to coincide with the 21st Conference of the Parties to the United Nations Framework Convention on Climate Change (COP21), held in Paris in December 2015. The book was distributed at the conference, and presentations of the book were given there by all three editors, in addition to several of the chapter authors. When the book was in preparation, it wasn't obvious that an agreement would be reached; and we couldn't be sure what the treaty would say, should an agreement be reached. But we did have a very good sense for what the text of the treaty was likely to include, and the book offers not just a window into this possible treaty, but a view of the much larger landscape of the problem--and of all the things that will need to be done after Paris, whether or not an agreement was reached there. This agenda remains as relevant today as it was then. The book is available for free online here.