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GLOBAL WARMING SOC450 What are greenhouse gases?
Greenhouse gases are gases that trap heat in the atmosphere and heat the earth’s surface. These gaseous compounds are capable of absorbing infrared radiation and holding heat in the atmosphere. As a result, they cause the greenhouse effect which leads to global warming. The main greenhouse gas is carbon dioxide CO2 which is emitted through general human activities. Recent studies show that carbon dioxide accounted for 81.6% of the U.S greenhouse gas emission through human activities. The gas is a natural part of the earth’s carbon cycle through its circulation. However, the human activities have increased its presence in the atmosphere making it toxic. There is a huge gap in the rate at which the gas is produced from human-related emissions to the rate at which it is absorbed in the natural cycle. This human activities are, combustion of fossil fuels, such as coal and oil, industrial processes in the energy and transportation sector, and changes in land use.("Overview of Greenhouse Gases | US EPA," 2018). The other greenhouse gas is methane which is also a hydrocarbon. This gas represented 10% of the U.S greenhouse gas emission through human-related activities like leaks and livestock keeping. Methane can also be emitted naturally in wetlands and is removed from the atmosphere by natural chemical reactions in the soil. A third greenhouse gas is the nitrous oxide which accounted for 6% of the radiative greenhouse gases. The fourth greenhouse gas is the CFC-11 (trichlorofluoromethane). This is also a stratospheric ozone layer depleting gas whose production is found in eastern Asia. This gas is potent and is regulated under the Montreal Protocol. Do they contribute to global warming?

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