NOVA has created a free interactive lesson on PBS LearningMedia, Choosing Earth’s Climate Future, that can be completed in approximately two 45-minute class periods. A great resource for classroom educators. 

"Using video excerpts from NOVA Decoding the Weather Machine and climate change data from organizations like NASA, NOAA, and the National Renewable Energy Laboratory, students will understand how choices made today will affect the extent of global climate change and the impacts felt throughout the world and develop a climate change action plan for their community."