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Global warming is the latest alarm bell for earth’s environment. Global warming
refers to the increase in average temperature of earth’s surface during the last
century, from 1900-2000. Earth’s surface’s temperature has increased more than
one degree Fahrenheit since 1900. Global warming is alarming because of its
adverse effects on the ecological balance of earth. The resultant ecological
imbalance, due to global warming, is the root cause of various natural calamities
like floods, famines, etc. Also it is the root cause of various environmental threats
like increase in sea level, glacier melting, changes in quantity and pattern of
rainfall, heat waves, extreme seasons, etc. This is why global warming is the
buzzword of almost all environmental talks, projects and discussions, etc.
Global warming is a threat to the very existence of life on earth. Not only human,
but any other form of life, be it flora or fauna face a threat in the face of global
warming. Hence, it has became the pungent need of the hour to root out the
causes of this threating phenomenon.
The most evident causes of global warming are industrialization, urbanization,
deforestation, sophisticated human lifestyle and related human activities. These
human activities and trends have led to increased emission of greenhouse gases
like carbon dioxide, methane, nitrous oxide, etc. These gases in turn has led to
an increase in average temperature of earth’s surface, hence global warming history.
Greenhouse effect is a natural process wherein sunlight passes through
atmosphere, warming earth’s surface. Then, the earth’s surface and water bodies
release energy in form of heat or infrared radiations into atmosphere and
maintains balance with the incoming energy. Greenhouse gases can absorb
some of the infrared radiation. But increase in greenhouse gases has led to more
absorption of infrared radiation which in turn has led to the increase of earth’s
surface temperature.