In this lesson, you learned about the processes behind climate change, primarily the greenhouse effect and corresponding carbon cycle. You also characterized the six primary greenhouse gases: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), perfluorocarbons (PCs) and sulfur hexafluoride (SF6).
You have finished Lesson 4. Double-check the list of requirements on the Lesson 4 Overview page to make sure you have completed all of the activities listed there before beginning the next lesson.