Question

Which of the following decreases carbon dioxide levels in the atmosphere?

• A. Cellular Respiration
• B. Decomposition by bacteria
• C. Burning fossil fuels
• D. Photosynthesis

Answer 1

Answer: (D)

Photosynthesis

During Photosynthesis plants i.e. leaves take in carbon dioxide (CO2CO2) to make glucose. This reduces the carbon dioxide in the atmosphere. This is why trees, grasses, and algae all are solutions to global warming caused by excessive carbon dioxide (CO2CO2). All three of the other processes involve taking in oxygen (O2O2) and releasing carbon dioxide (CO2CO2), thus increasing the carbon dioxide in the atmosphere.

So, the correct answer is 'Photosynthesis'.