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Plants use the CO2 waste gas from animal respiration to make glucose for chemical energy for cells and they put out oxygen into the atmosphere. Oxygen is taken in by animals, used to break down glucose to make ATP for energy for cellular processes, and giving out CO2 which plants take in for photosynthesis.arbon dioxide is used by plants during photosynthesis to manufacture glucose; this is where the carbon in the equation comes from.
CO2 Systems. Plants use the carbon dioxide (CO2) that occurs naturally in our atmosphere, along with sunlight, to make the energy it takes for growth. Plants will exhaust the level of atmospheric CO2 â 300 parts per million (ppm) â as they grow in enclosed spaces (when CO2 levels fall to 200 ppm, plant growth ceases).ver years of testing, itâs been found that the best levels of CO2 for plant growth are around 1500 ppm. Make sure your plants never exhaust their supply of carbon dioxide and grow fast and strong under optimum levels with these easy to use CO2 systems.