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In 1920, Scientific American reported that the atmosphere was deficient in CO2, and that crop productivity could be greatly enhanced by introducing CO2 emissions from from smokestacks, and that earth was covered with luxuriant forests when CO2 levels were much higher. © Real Climate Science Fertilizing the air with carbon dioxide to promote plant growth ONE of the principal constituents making up the body of a plant is carbon, representing about one-half of its organic substance. The opinion that this carbon is derived from the soil has long been abandoned, modern investigation having shown atmospheric carbonic acid to be absorbed by means of the chlorophyll or green matter of the leaves and decomposed into its elements, the carbon, in conjunction with the root sap and atmospheric moisture, being worked into organic compounds.

United statesScientific americanAmerican articleReal climateReal climate scienceDoes risingஒன்றுபட்டது மாநிலங்களில்அறிவியல் அமெரிக்கன்அமெரிக்கன் கட்டுரைரியல் காலநிலைரியல் காலநிலை அறிவியல்செய்யும் உயரும்