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    Photosynthesis is the process by which plants use sunlight to produce food and energy from carbon dioxide and water. Photosynthesis generates oxygen as a byproduct. Because carbon dioxide is one of the major air pollutants, without photosynthesis the air would be less clean.    Also, because oxygen constitutes a major part of the air we breathe, without photosynthesis there would be less air to breathe.
    The energy produced by photosynthesis is used in fossil fuels. This is because the organisms long ago ate green plants and when they died they became embedded in the Earth's crust.
    Photosynthesis is a light energized oxidation reduction process, chemically speaking. Light energy is used to drive the oxidation of water, create oxygen, hydrogen ions and electrons. A lot of the removed electrons and hydrogen ions are taken away and transferred to carbon dioxide. The carbon dioxide is then reduced to organic products. The rest of the electrons and hydrogen ions are used to reduce nitrate and sulfate into amino and sulfhydryl groups in amino acids.
    Carbohydrates are the main direct product of photosynthesis. The formula in which carbohydrates are formed during photosynthesis is:
Chemical equation. 
    The rate of photosynthesis is defined by the rate of oxygen production. The most important environmental factors that affect the rate of photosynthesis are the amount of light, carbon dioxide supply, temperature, water supply, and minerals.