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Climate
is the average state of the
lower atmosphere and the
associated characteristics
of the underlying land or
water in a particular
region, usually spanning
serveral years. Climate
variability is the variation
around the average climate
including seasonal
variations and large scale
regional cycles in
atmospheric and ocean
circulations.
Climate
change is the longer term
shift in climate of specific
location, region or the
entire planet. This change
is measured by the features
assoicated with average
weather such as temperature,
wind patterns and
precipitation. A Change in
the variability of climate
is also considered as
climate change, even if
average weather conditions
remain unchanged. The
world's climate has changed
many times in the past, and
it is chaning again. So, we
have this concern becaouse
the speed of the current is
chaning rapidly disrupting
many communities and
ecosystem. And also human
activities are a major
contributor to the changes
that are occurring now.
Causes of climate change:
Long-team significant change
in the 'average weather'
that a region experiences is
what we call climate change.
Presence of greenhouse gases
(like carbon dioxide,
methane, nitrous oxides,
ozone and halocarbons) in
the earth's atmosphere leads
heat trapping and its effect
is known as greenhouse
effect. This leading to
global warming, a
tremperature increasing
proccess, which results in
climate change. Carbon
dioxide (CO2) is the mos
important anthropogenic
greenhouse gas. Its annual
emission grew by about 80%
between 1997 and 2004.
Global increases in CO2
concentrations and due
primarily to fossil fuel
use, with land- use change
providing another
significant but smaller
contribution
- By
Udeep Regmi
BDevS
2nd Year, Sec. B |
