of climate change
climate is dynamic and always changing through a natural cycle. What
the world is more worried about is that the changes that are occurring
today have been speeded up because of man's activities. These changes
are being studied by scientists all over the world who are finding
evidence from tree rings, pollen samples, ice cores, and sea sediments.
The causes of climate change can be divided into two categories -
those that are due to natural causes and those that are created by
There are a number of natural factors responsible for climate change.
Some of the more prominent ones are continental drift, volcanoes,
ocean currents, the earth's tilt, and comets and meteorites. Let's
look at them in a little detail.
You may have noticed something peculiar about South America and Africa
on a map of the world - don't they seem to fit into each other like
pieces in a jigsaw puzzle?
About 200 million years ago they were joined together! Scientists
believe that back then, the earth was not as we see it today, but
the continents were all part of one large landmass. Proof of this
comes from the similarity between plant and animal fossils and broad
belts of rocks found on the eastern coastline of South America and
western coastline of Africa, which are now widely separated by the
Atlantic Ocean. The discovery of fossils of tropical plants (in the
form of coal deposits) in Antarctica has led to the conclusion that
this frozen land at some time in the past, must have been situated
closer to the equator, where the climate was tropical, with swamps
and plenty of lush vegetation.
that we are familiar with today were formed when the landmass began
gradually drifting apart, millions of years back. This drift also
had an impact on the climate because it changed the physical features
of the landmass, their position and the position of water bodies.
The separation of the landmasses changed the flow of ocean currents
and winds, which affected the climate. This drift of the continents
continues even today; the Himalayan range is rising by about 1 mm
(millimeter) every year because the Indian land mass is moving towards
the Asian land mass, slowly but steadily.
When a volcano erupts it throws out large volumes of sulphur dioxide
(SO2), water vapour, dust, and ash into the atmosphere.
Although the volcanic activity may last only a few days, yet the large
volumes of gases and ash can influence climatic patterns for years.
Millions of tonnes of sulphur dioxide gas can reach the upper levels
of the atmosphere (called the stratosphere) from a major eruption.
The gases and dust particles partially block the incoming rays of
the sun, leading to cooling. Sulphur dioxide combines with water to
form tiny droplets of sulphuric acid. These droplets are so small
that many of them can stay aloft for several years. They are efficient
reflectors of sunlight, and screen the ground from some of the energy
that it would ordinarily receive from the sun. Winds in the upper
levels of the atmopshere, called the stratosphere, carry the aerosols
rapidly around the globe in either an easterly or westerly direction.
Movement of aerosols north and south is always much slower. This should
give you some idea of the ways by which cooling can be brought about
for a few years after a major volcanic eruption.
in the Philippine islands erupted in April 1991 emitting thousands
of tonnes of gases into the atmosphere. Volcanic eruptions of this
magnitude can reduce the amount of solar radiation reaching the Earth's
surface, lowering temperatures in the lower levels of the atmosphere
(called the troposphere), and changing atmospheric circulation patterns.
The extent to which this occurs is an ongoing debate.
Another striking example was in the year 1816, often referred to as
"the year without a summer." Significant weather-related
disruptions occurred in New England and in Western Europe with killing
summer frosts in the United States and Canada. These strange phenomena
were attributed to a major eruption of the Tambora volcano in Indonesia,
The earth makes one full orbit around the sun each year. It is tilted
at an angle of 23.5° to the perpendicular plane of its orbital
path. For one half of the year when it is summer, the northern hemisphere
tilts towards the sun. In the other half when it is winter, the earth
is tilted away from the sun. If there was no tilt we would not have
experienced seasons. Changes in the tilt of the earth can affect the
severity of the seasons - more tilt means warmer summers and colder
winters; less tilt means cooler summers and milder winters.
The Earth's orbit is somewhat elliptical, which means that the distance
between the earth and the Sun varies over the course of a year. We
usually think of the earth's axis as being fixed, after all, it always
seems to point toward Polaris (also known as the Pole Star and the
North Star). Actually, it is not quite constant: the axis does move,
at the rate of a little more than a half-degree each century. So Polaris
has not always been, and will not always be, the star pointing to
the North. When the pyramids were built, around 2500 BC, the pole
was near the star Thuban (Alpha Draconis). This gradual change in
the direction of the earth's axis, called precession is responsible
for changes in the climate.
The oceans are a major component of the climate system. They cover
about 71% of the Earth and absorb about twice as much of the sun's
radiation as the atmosphere or the land surface. Ocean currents move
vast amounts of heat across the planet - roughly the same amount as
the atmosphere does. But the oceans are surrounded by land masses,
so heat transport through the water is through channels.
Winds push horizontally against the sea surface and drive ocean current
Certain parts of the world are influenced by ocean currents more than
others. The coast of Peru and other adjoining regions are directly
influenced by the Humboldt current that flows along the coastline
of Peru. The El Niño event in the Pacific Ocean can affect
climatic conditions all over the world.
Another region that is strongly influenced by ocean currents is the
North Atlantic. If we compare places at the same latitude in Europe
and North America the effect is immediately obvious. Take a closer
look at this example - some parts of coastal Norway have an average
temperature of -2°C in January and 14°C in July; while places
at the same latitude on the Pacific coast of Alaska are far colder:
-15°C in January and only 10°C in July. The warm current along
the Norewgian coast keeps much of the Greenland-Norwegian Sea free
of ice even in winter. The rest of the Arctic Ocean, even though it
is much further south, remains frozen.
Ocean currents have been known to change direction or slow down. Much
of the heat that escapes from the oceans is in the form of water vapour,
the most abundant greenhouse gas on Earth. Yet, water vapor also contributes
to the formation of clouds, which shade the surface and have a net
Any or all of these phenomena can have an impact on the climate, as
is believed to have happened at the end of the last Ice Age, about
14,000 years ago.
The Industrial Revolution in the 19th century saw the large-scale
use of fossil fuels for industrial activities. These industries created
jobs and over the years, people moved from rural areas to the cities.
This trend is continuing even today. More and more land that was covered
with vegetation has been cleared to make way for houses. Natural resources
are being used extensively for construction, industries, transport,
and consumption. Consumerism (our increasing want for material things)
has increased by leaps and bounds, creating mountains of waste. Also,
our population has increased to an incredible extent.
All this has contributed to a rise in greenhouse gases in the atmosphere.
Fossil fuels such as oil, coal and natural gas supply most of the
energy needed to run vehicles, generate electricity for industries,
households, etc. The energy sector is responsible for about ¾
of the carbon dioxide emissions, 1/5 of the methane emissions and
a large quantity of nitrous oxide. It also produces nitrogen oxides
(NOx) and carbon monoxide (CO) which are not greenhouse gases but
do have an influence on the chemical cycles in the atmosphere that
produce or destroy greenhouse gases.
Greenhouse gases and their
Carbon dioxide is undoubtedly, the most important greenhouse gas in
the atmosphere. Changes in land use pattern, deforestation, land clearing,
agriculture, and other activities have all led to a rise in the emission
of carbon dioxide.
Methane is another important greenhouse gas in the atmosphere. About
¼ of all methane emissions are said to come from domesticated
animals such as dairy cows, goats, pigs, buffaloes, camels, horses,
and sheep. These animals produce methane during the cud-chewing process.
Methane is also released from rice or paddy fields that are flooded
during the sowing and maturing periods. When soil is covered with
water it becomes anaerobic or lacking in oxygen. Under such conditions,
methane-producing bacteria and other organisms decompose organic matter
in the soil to form methane. Nearly 90% of the paddy-growing area
in the world is found in Asia, as rice is the staple food there. China
and India, between them, have 80-90% of the world's rice-growing areas.
Methane is also emitted from landfills and other waste dumps. If the
waste is put into an incinerator
or burnt in the open, carbon dioxide is emitted. Methane is also emitted
during the process of oil drilling, coal mining and also from leaking
gas pipelines (due to accidents and poor maintenance of sites).
A large amount of nitrous oxide emission has been attributed to fertilizer
application. This in turn depends on the type of fertilizer that is
used, how and when it is used and the methods of tilling that are
followed. Contributions are also made by leguminous plants, such as
beans and pulses that add nitrogen to the soil.
we all contribute every day
All of us in our daily lives contribute our bit to this change in
the climate. Give these points a good, serious thought:
- Electricity is the
main source of power in urban areas. All our gadgets run on electricity
generated mainly from thermal power plants. These thermal power
plants are run on fossil fuels (mostly coal) and are responsible
for the emission of huge amounts of greenhouse gases and other pollutants.
- Cars, buses, and trucks are the principal ways by which goods
and people are transported in most of our cities. These are run
mainly on petrol or diesel, both fossil fuels.
- We generate large quantities of waste in the form of plastics
that remain in the environment for many years and cause damage.
- We use a huge quantity of paper in our work at schools and in
offices. Have we ever thought about the number of trees that we
use in a day?
- Timber is used in large quantities for construction of houses,
which means that large areas of forest have to be cut down.
- A growing population has meant more and more mouths to feed. Because
the land area available for agriculture is limited (and in fact,
is actually shrinking as a result of ecological degradation!), high-yielding
varieties of crop are being grown to increase the agricultural output
from a given area of land. However, such high-yielding varieties
of crops require large quantities of fertilizers; and more fertilizer
means more emissions of nitrous oxide, both from the field into
which it is put and the fertilizer industry that makes it. Pollution
also results from the run-off of fertilizer into water bodies.