Explore the physical controls of Earth's climate and climate change in this 36-minute APS March Meeting 2013 lecture. Delve into the climate modeling enterprise, systems viewpoint, and energy balance, including cloud radiative effects and ocean heat content. Examine reflected sunlight from Earth, energy balance under simulated climate change, and climate sensitivity and feedbacks. Investigate cloud and water vapor feedbacks, global precipitation controls, and aerosol indirect effects on clouds and precipitation. Gain insights into the importance of detailed climate processes and their impact on our understanding of Earth's complex climate system.