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Green plants produce oxygen, an essential commodity for virtually all life forms on the planet (excepting a few anaerobic micro-organisms). This occurs in the chloroplasts within leaves in a process known as photosynthesis. The chloroplasts contain a green pigment, chlorophyll, which synthesises hydrocarbons for the plant's growth requirements in the presence of four factors: sunlight, carbon dioxide, water and heat. Oxygen is a waste product of this process, and is librated in high amounts: the more leaves there are on a tree, the more oxygen will be released if the four factor conditions are met. During darkness the opposite reaction occurs, slowly; carbon dioxide is liberated as the plant cells utilise the synthesised hydrocarbons and oxygen. As a tree grows, more carbon dioxide is absorbed than released to the atmosphere.
Trees shade the earth from the heat of the sun, again protecting topsoil. Woodlands and forests provide shelter and food for countless animals and birds. Trees provide nutritional food in the form of fruits, berries, nuts and some tree leaves are edible and the bark and nuts of some trees are used medicinally or as spices.
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Through photosynthesis, trees and other plants take in carbon dioxide and replace it with oxygen. By restoring tree cover to barren lands, we have a very cost-effective way to continuously remove carbon dioxide (the major "greenhouse gas") from the global atmosphere.
Global warming
Global Warming
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