Explore climate science through the lens of physical principles and Earth system science. Examine the key components of the Earth system--the atmosphere, hydrosphere, lithosphere, cryosphere, and biosphere--their interactions, and their responses to both natural and human-induced forcing. Discuss radiation, energy balance, and atmospheric/oceanic general circulation; the hydrological cycle, with a focus on surface hydrology and land-atmosphere interactions; climate feedbacks, sensitivity, and variability across temporal scales (past, present, and future). Focus on human impacts on the climate system, including urbanization, irrigation, industrialization, air pollution, and tropical deforestation.