Which of the following is the major limiting factor for photosynthesis?

Carbon dioxide (CO₂) is often considered the major limiting factor for photosynthesis. 

In environments where CO₂ is scarce, such as in closed spaces or under certain environmental conditions, the rate of photosynthesis can be limited. 

Plants require CO₂ to create sugars and organic compounds through the process of photosynthesis. If the concentration of CO₂ is insufficient, it can slow down or limit the overall process of converting light energy into chemical energy, subsequently affecting the plant's growth and productivity.