QuestionMay 13, 2026

Part 3-Questions After completing the reading and videos, answer the following questions Any data, calculations, or models you use to support your thinking should be explained. 1. How does the current concentration of CO_(2) compare to those that have occurred in the past several hundred millennia (thousands of years)?

Part 3-Questions After completing the reading and videos, answer the following questions Any data, calculations, or models you use to support your thinking should be explained. 1. How does the current concentration of CO_(2) compare to those that have occurred in the past several hundred millennia (thousands of years)?
Part 3-Questions After completing the reading and videos, answer the following questions Any data, calculations, or
models you use to support your thinking should be explained.
1. How does the current concentration of CO_(2) compare to those that have occurred in the past several hundred
millennia (thousands of years)?

Solution
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Answer

Current CO_{2} concentration is significantly higher than historical levels, exceeding past maximums by approximately 120 ppm. Explanation 1. Identify historical CO_{2} concentration levels Historical data from ice cores show CO_{2} levels fluctuating between 180-300 ppm over the past 800,000 years. 2. Determine current CO_{2} concentration Current CO_{2} levels are approximately 420 ppm, as measured by modern instruments. 3. Compare historical and current levels Current levels exceed historical maximums by about 120 ppm, indicating a significant increase.

Explanation

1. Identify historical $CO_{2}$ concentration levels<br /> Historical data from ice cores show $CO_{2}$ levels fluctuating between 180-300 ppm over the past 800,000 years.<br /><br />2. Determine current $CO_{2}$ concentration<br /> Current $CO_{2}$ levels are approximately 420 ppm, as measured by modern instruments.<br /><br />3. Compare historical and current levels<br /> Current levels exceed historical maximums by about 120 ppm, indicating a significant increase.
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