The document discusses global warming, providing an introduction, history, causes, effects and steps that can be taken. It notes that global warming refers to rising average temperatures since the late 19th century due to increased greenhouse gases from sources like fossil fuel burning and deforestation. Some effects include melting ice caps, more extreme weather, and rising sea levels. Reducing emissions through clean energy and more fuel-efficient transportation can help address the risks of global warming.
1. Global warming….
Contents covered
• Introduction
• History
• Causes
• Effects
• Global warming and climate change
• Graph
• Facts
• Why is global warming a concern
• Steps to be taken
2. Introduction
• Global warming refers to the rising average
temperature of Earth's atmosphere and oceans,
which began to increase in the late 19th century
and is projected to continue rising.
• The Earth's average surface temperature, expressed
as a linear trend, rose by 0.74±0.18 °C over the
period 1906–2005.
• Currently global warming has lead to a great extent
resulting in tremendous changes in the earth.
3. History of earth
• Earth formed ~4.6 billion years ago
originally very hot
• Sun’s energy output only 70% of present
• Liquid water present ~4.3 billion years
ago
• Much of the earth’s early history erased
during late heavy bombardment (~3.9
billion years ago )
6. Major Cause
Air pollution
• Excessive Use Of
Automobiles
• Hazardous Industrial Gases
• Thermal Power Plants
• Smoke And Fumes
7. Effects of global warming
• Melting ice : melting ice caps will throw the
global ecosystem out of balance.
• Flooding :represents one of the most
dangerous hazards to human settlements and is
one of the most potentially momentous impacts
of global warming.
• Hurricane :ocean temperature is a key factor for
hurricane formation
• Smog :A powerful combination of vehicular
fumes, ground-level ozone, airborne industries.
10. Energy utilization
18% 11%
9%
5%
3%
11%
4%
39%
Fridge TV Fan Computer AC Heater/Geyser Appliances Light
11. Facts
• Without the atmosphere to create a greenhouse-
type effect, the average temperature on Earth would
be just 5° Fahrenheit (F).g
• According to NASA studies, average temperatures
around the world have increased 1.4° F since 1880,
with most of the change occurring in recent
decades.f
• As Arctic ice rapidly disappears, scientists believe the
Arctic will experience its first ice-free summer as
early as the year 2040.f
• Between the years 1961 and 1997, the world’s
glaciers lost 890 cubic miles of ice.b
12. Facts
• Fossil fuel burning currently adds nearly six billion
tons of CO2 to the atmosphere every year. Only half
of this CO2 is removed by forests and oceans.e
• Cars amount to three-quarters of all transportation
emissions. At the current rate, the world will be
driven on by more than a billion cars in 2030 and a
billion more by 2050.g
• Scientists estimate that just 20,000 to 25,000 polar
bears still survive in the wild.g
• The earth’s atmosphere now contains 40% more
CO2 than before the Industrial Revolution.g
13. Why is global warming a
concern ?
• The Rapid Rise In Greenhouse Gases Is A Problem Because
It Is Changing The Climate Faster Than Some Living Things
May Be Able To Adapt.
• historically, earth’s climate has regularly shifted
Back And Forth Between Temperatures Like Those We See
Today ..
• Now, With Concentrations Of Greenhouse Gases Rising,
earth’s remaining ice sheets (such as greenland and
Antarctica)
• As The Mercury Rises, The Climate Can Change In
Unexpected Ways.
14. Steps to be taken
• Clean or replace filters on your furnace and air
conditioner
• Choose energy efficient appliances when
making new purchase
• Do not leave appliances on standby
• Get a home energy audit
• Use less hot water
• Recycle your organic waste
• Reuse your shopping bag
• Reduce waste
•
15. Steps to be taken
• Buy organic foods as much as possible
• Drive carefully and do not waste fuel
• Protect and conserve forest worldwide
• Encourage the switch to renewable
energy
• When it is time for a new car, choose a
more fuel efficient vehicle
• Try creating awareness among your
society.
• Plant a tree
