AN ESSAY ON GLOBAL WARMING_GREEN HOUSE EFFECT

AN ESSAY ON GLOBAL WARMING_GREEN   HOUSE EFFECT

The temperature effects of carbon dioxide and water vapor combine together to have a long range impact on the global climate. As the surface temperature increase, the of surface water increase, thereby raising the temperature further. It is estimated that this combined effect of rise of temperature will bring about 30 degree Celsius in surface temperature, if the carbon dioxide concentration is doubled in the The most alarming fact is that a slight increase in surface temperature say around 1 degree Celsius can adversely affect the world food production. As a result the wheat growing zones in the northern latitude will be shifted from USSR and Canada to the northern poles, that means from the fertile solids to the poor soils. The biological productivity will also decrease due towarming of the surface layer, which in turn reduces the transport of nutrients from deeper layers to the surface by vertical circulation.

Rise in global temperatures causes many climatic changes also, but the most drastic change will be the increase in sea-level. Already, the rise in global temperatures have resulted in cracks in the Antartic ice shelf. Melting of even fraction of the volume of polar ice can result in flooding of many low lying areas around the earth. Other climate changes include floods, droughts, storms and exceptionally warm summers. Europe and American have already witnessed these changes considerably. The summer of 1998 predicted to be the warmest in the century.

The age old proverb, "Everybody talks about weather, but nobody does anything about it", is not valid in this century. A world-wide study shows that the average temperatures of the earth has raised by as mush as 0.2 degree Celsius every decade. The rise in temperature is due to global warming, which has now become an imminent threat.