Has the earth gone through a period of climate change before?

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    Earth’s climate has fluctuated throughout history. Around 100 million years ago the world was warmer than it is today. Fossil distribution from that time suggests that there were no polar ice caps because it was so warm. On the other hand, the most recent ice age ended only 10,000 years ago. Factors that affected massive climate change in the past include the tilt of the Earth’s axis and plate tectonics (the shifting of Earth’s crust). Most scientists today agree that recent climate change can be attributed to man-made causes, most conspicuously the increase in greenhouse gases in the atmosphere.

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