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Photosynthesis: Math Lesson: Activity 1 of 3

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We looked at the highs and lows of CO₂ over hundreds of thousands of years. With all that fluctuation—going up and down—how much did the level of CO₂ really change?


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Over the past 400,000 years, before 1950, the level of CO₂ has fluctuated—gone up and down—between 180 ppm (the minimum), and the 300 ppm (the maximum). Over what range did the level of CO₂ fluctuate during this period?
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Question 3 of 10