Global climate change

 Changing climate
 Causes of climate
change
 Effects of climate
change
 Statistical Statement
 Illustrate the climatic
situation
 Recommendation
 Question and Answer
Secession
2sakil.iubat@gmail.com

• Climate change refers to seasonal changes over a long
period of time.
• Worldwide, people are paying serious attention to climate
change.
• Because so many systems are tied to climate, such
as, people, plants and animals live, such as food
production, availability and use of water, and health risks.

Climate
change
Natural Factors
Volcanic eruptions
Ocean current
Earth orbital changes -
Solar variations
Forest fire
Artificial Factors
Human activities
Emission of green house gases
Solar radiation

Natural Factors
• Volcanic eruptions
• Ocean current
When a volcano erupts it throws out large
volumes of sulphurdioxide (SO2), water
vapour, dust, and ash into the atmosphere
The oceans are a major component of the
climate system. Ocean currents move vast
amounts of heat across the planet.

Forest fire
Earth orbital changes
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. Changes in the tilt of the earth
can lead to small but climatically
important changes in the strength of the
seasons.
A wildfire is any uncontrolled fire in an
area of combustible vegetation that occurs
in the countryside or a wilderness area.
Natural Factors

Human Activities
There is strong evidence that the climate
change over the last half-century has been
caused largely by human activity, such as the
burning of fossil fuels and including agriculture
and deforestation."

• Emission of green house
gases such as…
• Solar radiation
51% of solar radiation absorb by earth.
20% scattered by the clouds19% absorb
by clouds and atmosphere and 6%
scattered by atmosphere,4% reflected by
surface.
water vapour, carbon
dioxide, methane, nitrous oxide, ozone
and CFC's.

Effect of greenhouse gases.
Nitrous oxide
Water vapor
Carbon dioxide
Methane
Sulfur hexafluoride
Greenhouse gases trap the infrared
heat that is trying to escape back into
space.
Increase in the global average surface
temperature .
Greenhouse effect, contributing to global
warming.
The atmospheric trapping, or reflection of
radiant energy back toward the earth.

Global Warming
Global Warming is the increase of Earth's average surface temperature
due to effect of greenhouse gases.

 Sea level rising.
 Global temperature is rising.
 Health risk.
 Melting polar icebergs and glacier.
 Arctic sea ice loss.

Melting Of Glacier
Nearly 97% of Greenland's surface ice sheet thawed during a four
day period in July - more than it ever has in the last 30 years, NASA
satellite data shows.. 12sakil.iubat@gmail.com

Acid Rain
Acid rain is a rain or any other form of precipitation that is unusually acidic. Acid
rain is caused by emissions of sulfur dioxide and nitrogen oxides, which react with
the water molecules in the atmosphere to produce acids. 13sakil.iubat@gmail.com

Globally, power generation
emits nearly 10 billion tons
of CO2 per year.
Use Alternative energy such as
Wind power Solar energy etc

Worldwide, motor vehicles currently emit well over 900 million metric
tons of CO2 each year.
Use Electronic Car or Solar car as
alternative of Diesel, Petrol or gas engine.

Each year worldwide, currently over 93 million metric tons of CFC emit by
AC, Refrigerator, Aerosol and Body spray etc. 26sakil.iubat@gmail.com

Earth's total forest area continues to decrease at about 13 million hectares
per year.
 Planted 2 tree against 1 tree cutting.

Global climate change

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