Examine the graph. Note that the explanatory label indicates that during the Northern Hemisphere summer, CO₂ concentrations decrease because plants consume that gas during photosynthesis. But when it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere. When it is winter in the Northern Hemisphere, it is summer in the Southern Hemisphere. Why doesn't the Southern Hemisphere summer show this same CO₂ drawdown?

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Examine the graph. Note that the explanatory label indicates that during the Northern Hemisphere summer, CO₂ concentrations decrease because plants consume that gas during photosynthesis. But when it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere. When it is winter in the Northern Hemisphere, it is summer in the Southern Hemisphere. Why doesn't the Southern Hemisphere summer show this same CO₂ drawdown?

Examine the Graph