This lesson is designed to help students understand how the sun supplies almost all the energy we use, black body radiation, the balance between incoming solar energy and outgoing heat, and the greenhouse effect and gases that contribute to it. Students will discover that convection of heat in the atmosphere is the cause of weather phenomena and that water vapor also carries solar heat and plays an important role in atmospheric convection. In addition they will learn how buoyancy and convection cause thermal currents in the troposphere and affect the weather. Evaporation and humidity are also covered.