Question

the atmosphere will likely contain more carbon dioxide and less oxygen in the future
a. if we set aside more land for forest preserves.
b. if all coal burning power plants are replaced by wind turbines.
c. if more people ride bicycles instead of driving gasoline powered cars.
d. if the rate of deforestation continues to increase.

Explanation:

To solve this, we analyze each option:

• Option A: Setting aside land for forest preserves would increase trees, which absorb \( \text{CO}_2 \) and release \( \text{O}_2 \), so atmosphere would have less \( \text{CO}_2 \) and more \( \text{O}_2 \), not matching.
• Option B: Replacing coal plants with wind turbines reduces \( \text{CO}_2 \) emissions, leading to less \( \text{CO}_2 \) and more \( \text{O}_2 \) (relatively), not matching.
• Option C: Riding bicycles instead of driving gasoline - powered cars reduces \( \text{CO}_2 \) emissions, so \( \text{CO}_2 \) would be less and \( \text{O}_2 \) more (relatively), not matching.
• Option D: Deforestation means fewer trees. Trees absorb \( \text{CO}_2 \) during photosynthesis and release \( \text{O}_2 \). If deforestation increases, there are fewer trees to absorb \( \text{CO}_2 \) and release \( \text{O}_2 \). So \( \text{CO}_2 \) levels will rise and \( \text{O}_2 \) levels will fall, which matches the statement in the question.

Answer:

D. If the rate of deforestation continues to increase.