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But more typically for the last million years it's been 4 to 8 °C colder.Each transition from warm to glacial ages and back took thousands of years, giving humans and prehumans many generations to adjust.

Digging way back in time, we know that Earth's climate has certainly been very different than it is now: 2 billion years ago there was not even any oxygen in the atmosphere.

Our far distant ancestors survived through multiple gradual cycles of cold ice ages, but did not experience any previous "hot ages." We in our current form appeared only about 200,000 years ago. In each ice age global temperatures were colder by 4 °C.

The warmest period ever experienced by early humans was about 1 °C warmer (global average) than today.

All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Previous major global climate changes were glacial cycles that happened long before human civilization developed.

Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. The human species evolved during the last 2.5 million years.

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