Which factor becomes limiting when it is warm and bright enough?

In a situation where it is warm and bright enough, the factor that typically becomes limiting is carbon dioxide concentration. This is because, under optimal conditions of light and temperature, the rate of photosynthesis can increase significantly, provided there is sufficient water and nutrients in the soil. However, as photosynthesis proceeds, the available carbon dioxide may be consumed quickly, especially in environments where the plants or algae are rapidly growing.

When both light intensity and temperature are at conducive levels, plants can utilize these resources effectively to produce glucose through photosynthesis. Yet, if the carbon dioxide levels in the environment are not sufficient to meet the demand created by the increased rate of photosynthesis, this gas becomes the limiting factor. This means that while light and temperature are favorable, the lack of carbon dioxide will constrain further increases in the rate of photosynthesis, thereby limiting plant productivity. Thus, in bright and warm conditions, carbon dioxide concentration plays a critical role in regulating photosynthesis levels.