Astronomers are in a unique position to help people understand the danger of climate change and what we can do about it. This book is intended to help astronomers to be better educators and communicators about the causes and consequences of climate change, as well as better advocates for solutions. It discusses the science of climate change as relevant to astronomy, including topics such as the Earth's past to its potential future. It also explores how we can communicate about a divisive and emotionally charged topic in ways that can overcome common misconceptions and disinformation so as to inspire and motivate. The book also discusses how climate change is impacting astronomy as a profession, as well as ways that astronomy can reduce its carbon emissions. Key Features Covers science topics astronomers need to know to better understand climate change Includes methods for teaching climate change in college-level astronomy courses Provides strategies for effectively communicating climate change in informal education settings Includes a discussion of how astronomers can be advocates for solutions without compromising their roles as scientists