In the past 65 million years the average temperature of the Earth has been at least 16 °C (29 °F) warmer than now and 10 °C (18 °F) colder than now. Most of that change has been concentrated in even larger changes in temperature that have taken place in the Polar Regions. One important cause of those changes has been the changing geography of the Earth. The altered geography has had a lasting impact on the ocean currents and that has changed the Earth's climate. During that period of time the oceans have also been at least 150m (500ft) higher and 130m (425ft) lower (28) than they are today. It
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