The Earth has been considerably warmer in the past than it is now.
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Q40: Each tree ring documents one year of
Q41: Some basins in the desert southwest filled
Q42: Modern civilization developed mostly after the last
Q43: It is possible for regional average temperatures
Q44: (D-O) oscillations are slow changes to climate.
Q46: We are currently in a hot-house climate.
Q47: The earth was warmer 12,000 years ago
Q48: Climate is the state of the atmosphere
Q49: More sunlight reaches Earth's surface at the
Q50: Atmospheric carbon dioxide decreases during warm periods.
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