This interactive module examines Earth’s past and present climate, highlighting the effects of two important factors: solar radiation and the composition of the atmosphere.

Earth's climate is a complex system controlled by many factors. This Click & Learn explores the history of our climate over millions of years, during both warmer and colder periods. The Click & Learn also sheds light on the causes, implications, and severity of current climate change. The accompanying “Worksheet” guides students’ exploration of the Click & Learn.