Causes and Consequences of Global Warming

Causes and Consequences of Global Warming

 

Our planet earth has been experiencing increased temperatures as indicated by scientific research since the mid 20^th century, a phenomenon we now refer to as global warming. Earth receives a continuous flow of solar radiation which passes through the atmosphere and warms the earth. With increase in temperature the earth sends heat energy back to the atmosphere and some of this heat is absorbed by atmospheric gases such as carbon dioxide, methane, nitrogen oxides, ozone, halocarbons and water vapor. These gases occur naturally in the atmosphere forming a blanket over the earth and they retain the infrared radiation from the earth keeping it warm[i]. This green house gases keep the earth’s average temperature warm enough to sustain the life plants, animals and humans. Global warming refers to the rise in the average temperatures of the earth’s surface and the oceans (especially in the recent times). Global warming has been mainly attributed to anthropogenic causes.  There are many natural causes for the warming and cooling processes of the earth such as variations in solar luminosity, volcanic eruptions and radiative forcing as a result of variations in atmospheric composition particularly in the green house gases. Green house gases naturally have a mean warming effect on the earth.

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