When plants engage in cellular respiration, what will happen to co2 levels in the atmosphere? Why?

Increase

Explanation:

Cellular respiration 'burns glucose for energy as shown in the equation below;

C₆H₁₂O₆ + 6O₂ - -> 6CO₂ + 6H₂O + 36 or 38 ATP

One of the end product of this process if carbon dioxide. The carbon dioxide is expelled into the environment.