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Global Warming Global Warming aside from pollution is one of scientists biggest concerns Global Warming is caused by the Greenhouse effect There are 4 steps in the Greenhouse effect 1-Sunlight radiates from the sun through space to earths atmosphere 2- the sunlight enters the atmosphere and hits Earth Some of it turns into heat energy in the form of infrared light The heat gets absorbed by surrounding air and land which in turn makes it warm 3- Infrared rays which are remitted into the atmosphere are trapped by greenhouse gases 4- the gas then absorbs the light and is remitted back to the earths surface and warms it even more Some of the naturally occurring greenhouse gases are Methane and carbon dioxide This is the way the Earth keeps itself warm enough for humans to live on it The only problem with this is that humans enhance the process even more Over the past 200 years the emissions of greenhouse gases have been increasing due to the increase in technology that humans have developed example factories These human- induced gases include carbon dioxide methane nitrous oxide and ozone depleting substances such as CFCs also known as Chlorofluorocarbons hydrofluorocarbons and perfluorocarbons These gases are generated a number of human activities such as fossil fuel combustion waste disposal in landfills the use of a refrigerator numerous agricultural and industrial activities and the cutting down of numerous forests These human practices have already changed the chemical make up of the atmosphere Between the pre-industrial times and today we have seen the concentration of carbon dioxide rise 30 in some regions in particular the northern hemisphere human practices have increased concentrations of aerosols in atmosphere
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