Overview
What are the possible causes of continental glaciation?
How has the Earth's climate changed over the last 5-10 million years in comparison to the last 10,000 years? Why causes these changes or stability? Do not just focus on climate change in the last 100 years.
Note that the Pleistocene Ice Age Epoch began around 2.5 MYA and human civilization began around 10,000 years ago.
The charts in your book show the Global Temperature changes for the last 20 million years and the last 40,000 years.