Earth is a 4.55-billion-year-old planet undergoing continuous evolution. ?We will explore aspects of Earth?s evolutionary changes that have affected both climate and life through time. The chemical and physical interactions between the solid Earth, the atmosphere, the hydrosphere, and the biosphere are investigated, providing the basis for understanding how Earth behaves as a self-regulating system that controls the global environment. The effect of human activity on modern Global Change will also be emphasized.