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What was the long-term global temperature trend over the past 100 million years?
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What was the long-term global temperature trend over the past 100 million years?

User Gontovnik
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Over the past million years, Earth's globally averaged surface temperature has risen and fallen by about 5˚C in ice-age cycles, roughly every 100,000 years or so (Figure 2.1a).
User Clafouti
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