Professor William Nordhaus was honored with a Nobel Prize in Economics for his lifetime contributions to research and policy on climate change and macroeconomics. This book contains a collection of essays written by eleven leading climate change economists describing precisely how Professor Nordhaus changed climate change economics. The essays highlight the major contributions that Professor Nordhaus has made to understanding climate change. The book also discusses the important contributions Professor Nordhaus has made to develop effective policies to manage greenhouse gases both now and far into the future. Several authors also thank Professor Nordhaus for the influence he has had on the trajectory of their own careers. Finally, the essays press forward and discuss how the entire field continues to work on perfecting both climate change economics and policy.