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Climate change is caused by a gradual build-up of greenhouse gases. These gases absorb sunlight, which eventually warms the earth. Some of the most potent greenhouse gases include methane and carbon dioxide. Methane is 84 times more powerful than CO2; and it also has the potential to trap additional heat in the atmosphere. Moreover, methane is a precursor to ground-level ozone. Ozone is a harmful gas, as it causes cardiovascular disease, central nervous system dysfunction, and reproductive disorders.