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May 29, 2008

Title: Global Warming

Global warming, I increase of the temperature of the Earth due to the uses of fossil fuels and to other industrial processes that take to an accumulation ofhothouse gases (dioxide of coal, methane, nitrous oxidizes and chlorfluorocarbons) in the atmosphere. From 1896 it i known that the coal dioxide helps to prevent that the infrared rays escapes to thespace, that makes him to stay to relatively warm temperature in our planet (effect hothouse). However, the increment of the levels of coal dioxide dog causes an increase of the global temperature,what could believes you important climatic changes with serious implications for the agricultural productivity.

In January of 2001 the Intergovernmental Commission of the Organization of the UnitedNations (UN) about the Climatic Change presented to report in which showed that the half temperature of the Earth had increased 0,6 grades in the XX century. Also this formless prevé that the halftemperature of the planet will ascend between 1,4 and 5,8 ºC between 1990 and 2100. This increase will causes changes in the level of the it is (from final of the decade of 1960 it has grown between 0,1and 0,2 m and it will increase between 0,09 and 0,88 m between 1990 and 2100), decrease of the covered with hoists and snow (from final of the decade of 1960 it has diminished 10%) and the increase ofthe half temperature of the oceans.

Some scientists have outlined that this increment in the temperature could only be part of to natural fluctuation. However, this last report of the A showsthat the human activity contributes substantially to this climatic change. The heating of the terrestrial surface seems to be due, mainly, to the increase of the concentration of gases of effect hothouse(ace the coal dioxide) in the atmosphere.

May 29, 2008

Title: Water Pollution

Contamination of the water, incorporation to the water of strange matters, as microorganisms, chemical...
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