Global Warming
Global warming is the current increase in temperature of the
Earth’s surface (both land and water) as well as its atmosphere. Average
temperatures around the world have risen by 0.75ºC (1.4ºF) over the last 100
years. About two thirds of this increase has occurred since 1975. Carbon
dioxide, methane, Chlorofluoro Carbon, nitrous oxides are the green house gases
warming the earth’s surface. So it is also called green house effect. The CO2
is the most important of the green house gases contributing to 50% of global
warming. The burning of fossil fuel, and other biomass, deforestation result in
CO2. In the past, when the Earth experienced increases in temperature it was
the result of natural causes but today it is being caused by human activities.
Global warming adversely affects agriculture, horticulture and eco
system. Reduced rainfall, higher temperature and increased pest/weed growth
hamper farming. Threats to health arise due to increase in disease carrying
vectors such as mosquitoes resulting in malaria, dengue fever, encephalitis and
yellow fever.
An increase in the global average surface air temperature of such
magnitude will bring about alarming changes in rainfall patterns and other
climatic conditions, resulting in serious ecological disequilibrium.
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