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…showed last 75 words of 668 total…the depletion of trees. Only humans can cut down trees or burn forests. Nitrous oxide usage can reduced by not using nitrogen-based fertilizers. It can also be prevented by using fossil fuel power plants for electricity less and less. Nitrous oxide also comes from automobile exhaust. The Greenhouse Effect is probably the most serious problem on Earth. By reducing greenhouse gas emission usage little by little we can help the environment by preventing Global Warming.