This compelling textbook provides a broad overview of the science underpinning our understanding of our climate, and how it is changing. Presented in clear and accessible language, and requiring only minimal algebra, it enables students to understand how our planet "behaves" under "normal conditions" and how human activity has moved us away from that normal. It walks the student comprehensively through the basic science, including how greenhouse gases absorb radiation and, crucially, a chapter on aerosols, major players in climate change. Diverse case studies and examples illuminate the impact and connections to real world events while review questions and exercises consolidate knowledge. Including the latest results from the IPCC 6th Assessment Report, it concludes by exploring climate modelling, equipping students with an understanding of how to simulate both past climate changes and projections of future climate change. Online resources include lecture slides, solutions and Excel code.