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During photosynthesis, plants take in carbon dioxide and water. Sugar and oxygen are by-products of photosynthesis. Since humans need oxygen to live, plants are essential for producing oxygen therefore cutting down the rain forests would be a negative effect. Another would be that rain forests contain a very large amount of plant and animal species that are wiped out when the rain forest is cut down. Some of them are even beneficial for medicine. A third related to the first is that when there are less plants taking in carbon dioxide, there is a larger concentration in the atmosphere. There is a large debate going on over wheter this larger concentration of carbon dioxide is causing global increases in temperature, leading to adverse conditions in parts of the Earth that are at or below sea-level and flooded by the subsequent rise in sea-levels.

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