• Climate is dynamic; climate has changed through Earth's history.
  • The last major ice age took place in the Pleistocene.
  • Earth’s temperature was only 5° C (9° F) cooler than it is today.
  • Sunspots, plate tectonics, volcanism, asteroid impacts, and Earth's motions can affect Earth's temperature.
  • The video deals with the time period at the end of the Paleozoic, called the Permian, 250,000,000 years ago.
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