Methane is naturally broken down in the atmosphere. This process is being inhibited by carbon monoxide, a gas formed when fossil fuels are burnt. Moreover, Schneider, Stephen H (1989) also found that "on average CFCs are 40 times more effective as a greenhouse gas than CO2 and levels of CFC-11 have reached 223 parts per trillion and CFC-12 384 parts per trillion." They are used in aerosols and refrigerators and to make foam packaging. They are also responsible for reducing ozone in the stratosphere. In addition, as most fertilizers are based on ammonium nitrate, the increasing use of fertilizers in farming is adding to the amounts of N2O in the atmosphere. .
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After talking about the excess emission of the greenhouse gases, the impacts of the global warming are also what the scientist nowadays concern about. The first impact of the global warming is human health. Climate change may affect people's health both directly and indirectly. For example, heat stress and other heat related health problems are caused directly by very warm temperatures and high humidity. Untreated, heat stress can be a very serious medical problem. Scientists suspect that, in many places, global warming will increase the number of very hot days that occur during the year. More hot days increases the possibility of heat related health problems. Indirectly, ecological disturbances, air pollution, changes in food and water supplies, and coastal flooding are all examples of possible impacts that might affect human health.
The second impact of global warming is alternation of ecosystems. Climate change may alter the world's habitats and ecosystems . All living things are included in and rely on these places. Many of these places depend on a delicate balance of rainfall, temperature, and soil type. A rapid change in climate could upset this balance and seriously endanger many living things. Most past climate changes occurred slowly, allowing plants and animals to adapt to the new environment or move somewhere else.