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The continuous increase in the average temperature of  the air near the surface of the earth and oceans over the past few decades is called Global warming. The average increase in temperatures is about 0.75 degrees celcius and is due to the increase in the concentration of the greenhouse gases in the atmosphere.


Though the increase in the temperature is also affected by natural phenomena like solar variations and volcanic activity, their effect is much smaller compared to the green house effect due to human activity. It has been predicted that the increase in temperature over the next century could vary between 1 degree Celsius and 6 degrees Celcius. 


Some of  the predicted effects of  global warming are an increase in the sea levels. This is expected to adversely effect many coastal areas which are lying at sea level  as they may be submerged. Change in weather patterns and rainfall in different regions are also expected, which will affect agricultural activity.

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