Does photosynthesis produce more water than it uses?
As said before, photosynthesis does not produce water, it uses the sun’s energy to combine carbon dioxide and water to produce carbohydrates and gives off oxygen as a by-product. At the present level of 383ppm CO2 is the critical rate limiting factor in photosynthesis, optimum is 1000ppm, and at 200ppm photosynthesis stops altogether. At the present level of CO2, plants are under stress and use water less efficiently that at higher levels.
