A: CO2 is a carbon source for photosynthesis. Experimental studies have shown that if the CO2 concentration is increased from atmospheric concentration (about 300 PPM) to 1000 PPM, the photosynthetic efficiency of plants can be more than doubled; if the CO2 concentration is lowered to 50 PPM, photosynthesis is stopped due to lack of raw materials. The CO2 concentration is in the range of 100-2000 PPM, and the crop yield increases as the CO2 concentration increases.
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