Global warming is the term used to describe a gradual increase in the average temperature of the Earth’s atmosphere and its oceans, a change that is believed to be permanently changing the Earth’s climate. Even though it is an ongoing debate, it is proved by the scientists that the planet is warming.
The 29th century is experiencing a continued increase of Earth’s mean atmospheric temperature by about 1.4 degrees F and about two thirds of it occurring since 1980. This is global warming is affecting the nature’s balance and has a huge impact on life like continued heat waves, and sudden occurrence of storms and floods. Don’t we see time to time the epidemics that are devastating to human life and the flooding of the farmlands that puts economy in a deep hole?
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Scientific evidence indicates that since 1950, the world’s climate has been warming, primarily as a result of emissions from non -stop burning of fossil fuels and the razing of tropical forests. Since the industrial revolution till this day, there is a constant emission of the carbon into the atmosphere, everything we do we leave carbon footprints. It is a man made cause of the global warming. The global emissions jumped 3 percent in 2011 and are expected to jump another 2.6 percent in 2012, researchers reported.
The greenhouse effect is a process by which the greenhouse gases absorb thermal radiation; these are then reradiated in all directions. But when some of these radiations come back to the surface and lower atmosphere, it causes increase in the average surface temperature leading to global warming.
Global warming Causes
The causes are many of which the main culprit is the increase in the greenhouse gases that is produced by burning fossil fuel and deforestation, thus intensifying the greenhouse effect leading to global warming. The four main contributors of the greenhouse effect are water vapour, carbon dioxide, methane and ozone.
Mining for coal and oil releases methane in the atmosphere. More ever the leakage from natural gas fields and landfills are additional source of methane. Excessive cutting down of the trees is another factor causing global warming. When deforestation happens the efficiency by which carbon dioxide is stored and oxygen released by the green plants are decreased to a huge rate in turn causing increased concentration of carbon dioxide that leads to increased greenhouse effect.
The nitrous oxide from fertilizers, gases used for refrigeration and industrial processes are other factors that cannot be forgotten as the cause of Global Warming.
Another source of methane is methane clathrate, a compound containing large amounts of methane trapped in the crystal structure of ice. As methane escapes from the Arctic seabed, the rate of global warming will increase significantly.
Ice caps and glaciers reflect sunlight, bouncing high temperature sun -rays back into space away from the Earth. When these icecaps are removed the earth gets warmer as the dark oceans absorb much thermal radiation from the sun.
Some regions may be wet with rain and some areas will suffer drought due to global warming. The climatic changes happen due to global warming. Seasonal changes are unpredictable unexpected thunderstorms might result as mentioned earlier.
The burning of wood (should be reduced to a greater extent) releases oxidizable carbon to the atmosphere whose presence in greater amount causes the elevation of temperature.
There is strong evidence that emissions of chlorofluorocarbons (CFCs) were the major cause of the recent abnormal warming. Like carbon CFC do not trap heat but in the presence of UV rays the chlorine gets detached from CFC, drifts up into the stratosphere and these unattached chlorines catalytically convert Ozone molecules into Oxygen molecules depleting the ozone layer.