Trees make energy in photosynthesis. This requires CO2 and water along with light energy to make oxygen and sugars. Photosynthesis is the reverse of respiration. In this way trees and other plants effectively take carbon dioxide out of the atmosphere and make energy in the form of sugars and release oxygen into the atmosphere.
Oxygen is its own element, 0. Carbon Dioxide (What plants use for nutrients) is composed of both carbon and oxygen (CO2). The Plants take in the CO2, use the carbon for food, and release the remaining oxygen into the air (a very beneficial process for humans indeed, go hug a tree when you get a chance).
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