Earth's current warming is linked to rising levels of atmospheric carbon dioxide due to human activities and the burning of fossil fuels. But the Earth has had warm climates in the past without nearly as high C0₂ levels, this lesson explains past warming.

In this lesson you will learn:
1) Mechanisms of past climate change
2) Three orbital variations that affect Earth's climate
3) How ice core proxy data confimed slide rule calculations

Time Requirement
This lesson should take around 1 hour.