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  1. Explore
  2. ..
  3. Climate change
  4. Global warming and Anthropogenic climate change
  5. The role of human activity
  6. Earth has seen regular cycles of massive changes...
  7. Ice core samples show that the planet goes through...
  8. Screening

Ice core samples show that the planet goes through regular cooling periods, with advancing ice followed by warming periods of ice retreat. Screening

A sub-fact in support for Earth has seen regular cycles of massive changes in climate and glaciation—and fossil fuels have had nothing to do with it.
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