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What Global Warming?
by Ray Matally
Category : News and Society |
Global warming assumes that it is caused by mankind and the climate scientist that believe in global warming say that it is caused by mankind's CO2 emissions from our factories, power plants and transportation. Global Warming is a term denoting a gradual warming of the Earths average temperature. The term has become synonymous to the Earths warming exclusively due to man-made effects, especially carbon dioxide. For the last period of a few decades the average temperature of all the areas of the world has been increasing at a very fast rate. Scientists have shown that the average temperature of the world has already increased by around 2 degree Celsius during the past period of around five decades. These rising global temperatures are going to cause a host of changes on our planet, and we need to act now or prepare to adjust to some very profound changes.
The Earths atmosphere is made up of different gases. Nitrogen makes up 78% of the total composition, Oxygen 21%, Argon 1% and traces gases 1%. Water vapor, carbon dioxide, methane, ozone, and nitrous oxide are the gases of interest since these are the greenhouse gases. Greenhouse gases can reradiate heat or trap heat absorbed by the Earth from the sun. Water vapor is by far the largest mechanism for heat retention out of the greenhouse gases.
There are three mechanisms which would cause global warming. There are: solar energy variance, gradual changes in the Earths orbit, tilt, and wobble, and greenhouse gas changes. It is difficult to calculate what percentage of the recent warming could be attributed to human activities. We can eliminate changes in the Earths orbit, tilt, and wobble causing a temperature increase since these are long term effects. The scientists place their opinion that highly release of carbon dioxide and several other gases in the atmosphere was highly responsible for the increase of global temperature. It was pointed out by the scientists that during the past few years there were high incidents of natural disasters around the world which were the mainly caused of increase of global temperature.
For that reason, it's important that we increase our knowledge of global warming, and do our best to prevent it in the coming years. While it may have adverse affects on our economy and our way of life, we owe it to our children to give them a peaceful, safe planet to grow up in.
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