21: Earth-System Change Last updated May 16, 2024 Save as PDF 17.4: Chapter 15 Summary and Key Term Check 21.1: What Is the Earth System? Page ID29193 Allison JonesSierra College ( \newcommand{\kernel}{\mathrm{null}\,}\) 21.1: What Is the Earth System?21.2: Causes of Climate Change21.3: Methods for Studying Past Climate21.4: Computer Models of the Earth System21.5: Humans in the Earth System21.6: Welcome to the Anthropocene21.7: Chapter 16 Summary and Key Term Check