A thin, invisible layer of air surrounds the Earth, sustaining all known life on the planet and creating the unique climates and weather patterns that make each part of the world different. In Firmament, atmospheric scientist and science communicator Simon Clark offers a rare and accessible tour of the ins and outs of the atmosphere and how we know what we know about it. From the workings of its different layers to why carbon dioxide is special, from pioneers like Pascal to the unsung heroes working in the field to help us understand climate change, Firmament introduces us to an oft-overlooked area of science and not only lays the ground work for us to better understand the debates surrounding the climate today, but also provides a glimpse of the future that is possible with this knowledge in hand.