Global warming: What is
Causing it?
The Warming of the Earth Could
Change the Way You Picture the
World!
Table of Contents
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Slide 1……………………Title Slide
Slide 2……………………Table of Contents
Slide 3……………………Global Warming Video
Slide 4……………………Causes of Global
Warming
Slide 5……………………Contributors to Global
Warming
Slide 6……………………What’s Up With the
Ozone ?
Slide 7……………………Greenhouse Gases
Slide 8……………………This News Is not New!
Slide 9……………………Which Countries are
Contributors?
Slide 10………………….The Breakdown
Researchers around the
world agree that the climate
around the world is
changing. Most people
believe that the world’s
population is contributing to
this climate change. This
idea is called Global
Warming.
Click on
me to
continue
Many scientists believe that some human activities cause global warming.
Some of these activities include:
•Cutting down trees
•Producing more trash
•Polluting the environment
•New Technologies that release greenhouse gases into the atmosphere.
There are, however, some scientist out there that do not believe that
humans are contributing to the climate change. Some researchers believe
that there is a natural warming pattern that the earth is following
17%
9%
57%
14%
3%
CFC's
Forestry
Agriculture
Other
Energy
What in the world is a CFC?
CFC stands for
Chlorofluorocarbons. These are
chemicals made up of carbon,
fluorine and chlorine atoms.
These chemicals are very
harmful to the environment and
are the one of the main
contributors to the ozone
depletion. CFC’s are often
found in household cleaning
solutions, hairsprays, and
spray paints.
The ozone is a layer of gases that protects the earth from harmful UV
rays. The CFC’s and other chemicals that are being produced and
released are burning holes in the ozone layer! If nothing is done to
stop these gases from being released the ozone layer will soon be
completely gone. The ozone layer is very fragile. Therefore, does not
take much to destroy it. When CFC’s reach the ozone layer the
extreme amount of ultra violet rays breaks them apart. As they break
apart they release chlorine atoms. The chlorine atoms then join the
oxygen atoms that are put out by the ozone. This combination burns
holes in the ozone layer. These holes now allow more harmful and
heat causing rays to reach the earth.
Greenhouse gases are gases that blanket the earth and absorb
heat . This heat absorption helps to keep the world warmer then it
would be with out them. The greenhouse gases are carbon dioxide,
nitrous oxide, and methane.
•Carbon Dioxide is released into the atmosphere by the
burning of solid waste, wood, wood products, and fossil fuels
(coal, oil, and natural gas)
•Nitrous Oxide emissions occur during various agriculture and
industrial processes, and when solid waste and fossil fuels are
burned.
• Methane is emitted when organic waste decomposes
(through livestock farming), and also during production and
transportation of fossil fuels.
The overproduction of these gases is leading to the
over heating of the earth.
1827
French polymath JeanBaptiste Fourier suggests
the existence of an
atmospheric effect
keeping the Earth warmer
than it would otherwise
be. He also uses the
analogy of a greenhouse.
1890’s to
1940
Average surface air
temperatures increase
by about 0.25 °C. Some
scientist see the
American Dust Bowl as
a sign of the
greenhouse effect at
work.
1957
US oceanographer
Roger Revelle warns
that people are
conducting a "largescale geophysical
experiment" on the
planet by releasing
greenhouse gases.
Colleague David
Keeling sets up first
continuous
monitoring of CO2
levels in the
atmosphere.
Immediately Keeling
finds regular yearon-year rise.
1987
Warmest year on
record. The 1980s turn
out to be the warmest
decade, with seven of
the eight warmest
years recorded up to
1990. Even the coldest
years in the 1980s were
warmer than the
warmest years of the
1880s.
Most countries are guilty to contributing to global warming, but the most
industrialized countries use the most energy. Therefore, they are most to
blame for the increase in the Earth’s temperatures.
Here is another
way to look at
It!
Look who uses the most energy!!!
Are you surprised?
Energy Used by Countries
(Measured in Millions of
BTU’s)
Japan
Germany
USA
147
190
340
Energy Used
340
350
300
250
Millions of 200
BTU's used 150
100
50
0
190
147
USA
Germany
Countries
Japan
Causes Of Global Warming
CFC's are emitted and
go into the atmosphere
The CFC's breakdown and join with oxygen that is released by the
ozone. These chemicals combined burn holes through the
ozone layer.
The holes in the ozone layer are allowing more heat
causing rays from the sun to reach the earth.
Now, because of the overproduction of greenhouse gases
this heat is being absorbed instead of released.