influences on climate change:
Anthropogenic factors are more influenced by human activities
that can lead to changes in
the environment and influence climate. In some cases the
chain of causality is direct and unambiguous,
while in others it is less clear. Various hypotheses for
human-induced climate change have been researched and debated for many
years, though it is important to note that the
scientific debate has moved on from skepticism, to
belief and scientific consensus that human activities
beyond doubt have contributed to the current rapid
changes in the Earth's
The biggest factor is the increase in carbon dioxide levels
in the atmosphere due to burning of fossil fuels (oil,
coal, natural gas). Other factors, which impacts climate
are land use, ozone
depletion, animal agriculture and deforestation.
causes climate change?
Several gases in the atmosphere act to trap the energy
from the sun, thereby warming the earth. These gases are
called greenhouse gases and the process is called
greenhouse effect. Without Earth's natural
greenhouse effect there would be no life
on earth. However what we are experiencing right now is
enhanced greenhouse effect
which is happening
largely due to the human activities over the last 150 - 200
years, particularly the burning of fossil fuels and deforestation,
all of which has
dramatically increased the concentration of greenhouse
gases in our atmosphere which in turn leads to the
warming up of earth's surface.
What is Greenhouse Effect?
In nature Greenhouse effect is extremely useful as it is
responsible for regulating Earth's temperature and
thereby help maintaining earth's temperature at a level
which can sustain life.
This phenomena works similar to the glass in a
greenhouse which keeps heat in the greenhouse. Our
atmosphere also traps the sun’s heat near earth’s
surface, primarily through heat-trapping properties of
certain “greenhouse gases”.
Earth is heated by sunlight. Most of the sun's energy
passes through the atmosphere, to
warm the earth's surface, oceans and atmosphere.
However, in order to keep the
atmosphere's energy in balance, the warmed earth also
emits heat energy back
to space as infrared radiation.
As this energy radiates upward, most is absorbed by
clouds and molecules of
greenhouse gases in the lower atmosphere. These
re-radiate the energy in all directions,
some back towards the surface and some upward, where
other molecules higher up can
absorb the energy again. This process of absorption and
re-emission is repeated until,
finally, the energy does escape from the atmosphere to
However, because much of the energy has been recycled
temperatures become much warmer then if the greenhouse
gases were absent from the
atmosphere. This natural process is known as the
Without greenhouse gases, Earth's average temperature
would be -19°C instead of
+14°C, or 33°C colder.
Over the past 10,000 years, the amount of greenhouse
gases in our atmosphere has
been relatively stable. Then a few centuries ago, their
concentrations began to increase
due to the increasing demand for energy caused by
industrialization and rising
populations, and due to changing land use and human
are Greenhouse gases?
Water vapors is the most common greenhouse gas. But
others that are very important too. Some
greenhouse gases such as CO2 or Carbon dioxide occur
naturally and are emitted to the atmosphere through
natural processes and human activities.
Carbon Dioxide or CO2 is the most significant
greenhouse gas released by human
activities, mostly through the burning of fossil fuels.
It is the main contributor to climate change. Carbon
dioxide enters the atmosphere through the burning of
fossil fuels such as oil, natural gas, and coal solid
waste, trees and wood products, and also as a result of
of manufacture of cement.
Methane is produced when vegetation is burned,
digested or rotted with no oxygen present. Garbage
dumps, rice paddies, and grazing cows and other
livestock release lots
Nitrous oxide can be found naturally in the
environment but human activities are
increasing the amounts. Nitrous oxide is released when
chemical fertilizers and manure are used in agriculture.
Halocarbons are a family of chemicals that include CFCs
(which also damage the ozone layer), and other
human-made chemicals that contain chlorine and fluorine.
should we do to slow the process?
Effects of Climate
The greenhouse effect can be reversed by two ways (1)
Forestation (2) Reduction of greenhouse gases.
Forestation will help in more more absorption and
cleaning of Co2 by trees. (2) Reduce fossil fuel usage
and embrace new environmental friendly technologies such
as solar energy wind energy and battery operated
automobiles etc. Push our governments to sign and
be the real impact of climate change remains uncertain, and
exact consequences of climate change to all living species
and environments across the world are also largely unknown.
However in order to learn about some estimated effects