Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (5 min)

  • Read Frequently Asked Question 6.2 (Is the Current Climate Change Unusual Compared to Earlier Changes in Earth’s History?, page 465).   It is particularly important to understand that although climate change is not a new phenomenon, past climate change is different from current climate change events.