Global Warming
Miss Parson – Allerton
Grange School
Aims and objectives
• To be able to define and understand the
process of Global Warming.
• Be able to describe the effects of
Global Warming on a global and local scale.
• Be able to recognise how the effects of
Global Warming can be reduced.
http://yosemite.epa.gov/oar/globalwarming.nsf/content/i
ndex.html (fab website!!)
What is
Global Warming ?
Global warming is the increase in the world’s
average temperature, believed to be the
result from the release of carbon dioxide
and other gases into the atmosphere by
burning fossil fuels.
This is causing an increase in the rate of the
greenhouse effect.
The Greenhouse
Effect
The earth is warming rather like
the inside of a greenhouse. On a
basic level the sun’s rays enter
the earths atmosphere and are
prevented from escaping by the
greenhouse gases. This results
in higher world temperatures.
In more detail………
The Greenhouse
Effect
Energy from the sun drives the earth's
weather and climate, and heats the earth's
surface; in turn, the earth radiates energy
back into space. Atmospheric greenhouse
gases (water vapor, carbon dioxide, and
other gases) trap some of the outgoing
energy, retaining heat somewhat like the
glass panels of a greenhouse.
Without this natural "greenhouse effect,"
temperatures would be much lower than
they are now, and life as known today would
not be possible. Instead, thanks to
greenhouse gases, the earth's average
temperature is a more hospitable 60°F.
However, problems may arise when the
atmospheric concentration of greenhouse
gases increases.
What are the
greenhouse gases?
Since the beginning of the industrial revolution, atmospheric
concentrations of carbon dioxide have increased nearly 30%,
methane concentrations have more than doubled, and nitrous
oxide concentrations have risen by about 15%. Why are
greenhouse gas concentrations increasing?
Nitrous Oxide is emitted
The major contributor is
Carbon Dioxide (approx
64%).
Methane is released
from decaying organic
matter, waste dumps,
animal dung, swamps
and peat bogs (approx
19%).
from car exhausts, power
stations and agricultural
fertiliser (approx 6%).
Burning of fossil fuels and other human
activities are the primary reason for the
increased concentration of carbon
dioxide.
CFC’s from aerosols,
air conditioners,
foam packaging and
refrigerators most
damaging (approx
6%).
Task 1:The
Greenhouse Effect
Using you worksheet answer
the section task 1.
This includes
1.
Defining global warming
and the greenhouse
effect
2.
Identifying the
greenhouse gases and
there causes
3.
Annotating a sketch to
show the process of
global warming.
Task 2 : Effects of global
warming
You are about to see a series of pictures which show some
of the effects of global warming. Write down the effects
or titles for the pictures on your worksheet in the correct
section (task 2).
I’m thinking !
What are the consequences
of Global Warming?
What are the
pictures showing,
what are the
effects of global
warming?
2
1
3
4
What are the consequences
of Global Warming?
What are the
pictures showing,
what are the
effects of global
warming?
5
6
7
8
What are the consequences
of Global Warming?
How did
you do?
Hurricanes –
extreme weather
Flooding of
coastal areas
Desertification
Ice caps melt
How did
you do?
Loss of wildlife
habitats and
species
Sea level rise
Extreme storms
Rise in
temperatures
There are also some
positive effects of global
warming
• Decrease in death and disease
• Healthier, faster growing forests due to excess CO2
• Longer growing seasons
• Warmer temperatures (UK Mediterranean climate!!)
• Plants and shrubs will be able to grow further north and in
present desert conditions
• Heavier rainfall in certain locations will give higher
agricultural production (Rice in India, Wheat in Africa).
How can Global Warming be
reduced?
• Reduce the use of fossil fuels. A major impact would be to
find alternatives to coal, oil and gas power stations.
• Afforest areas, trees use up the CO2, reduce deforestation.
• Reduce the reliance on the car (promote shared public
transport).
• Try to use energy efficiently (turn off lights and not use as
much!).
• Reduce, Reuse, Recycle.
• Careful long term planning to reduce the impact of global
warming.
Task 3 : Reducing the
impacts
On your Global Warming worksheet Write a
paragraph to show how you would make a
difference in reducing Global Warming.
Summary
• Global Warming is the increase in global temperatures due to
the increased rate of the Greenhouse Effect.
• Greenhouse gases trap the incoming solar radiation, these
gases include Carbon Dioxide, CFCs, Methane, Nitrous
Oxides and other Halocarbons. These are released by human
activity.
• We need the Greenhouse effect to maintain life on earth as
we know it…however if we keep adding to the Greenhouse
gases there will be many changes.
• Consequences can be negative ( ice caps melt, sea level rise,
extreme weather conditions) or positive (more rain in
drought areas, longer growing season).
Re do diagram slide 7
http://www.flickr.com/photos/wwworks/2222523486/ - slide 1
http://www.flickr.com/photos/dzwjedziak/375723120/ - slide 8 and 1
http://www.flickr.com/photos/bratan/452189020/ - slide 4
http://www.flickr.com/photos/hogbard/412932972/- slide 6
http://www.flickr.com/photos/tiger_empress/467671978/ - slide 8
http://www.flickr.com/photos/48135670@N00/97951579/ - slide 9,12
http://www.flickr.com/photos/60158441@N00/177929708/ - slide 9,12
http://www.flickr.com/photos/andzer/1480068258/ - slide 9,12
http://www.flickr.com/photos/nickrussill/146743082/ - slide 9,12
http://www.flickr.com/photos/dasha/443747644/ - slide 10,13
http://www.flickr.com/photos/11371618@N00/469788104/ - slide 10,13
http://www.flickr.com/photos/mikebaird/2087879492/ - slide 10,13
http://www.flickr.com/photos/7471118@N02/432453250/ - slide 10,13
http://www.flickr.com/photos/madron/2595909135/ - slide 11
http://www.flickr.com/photos/chi-liu/491412087/ - slide 12,13
http://www.flickr.com/photos/fabbriciuse/2073789872/ - slide 16
http://www.flickr.com/photos/algo/92463787/ - slide 16
http://www.flickr.com/photos/nickwheeleroz/2295584401/ - slide 16
http://www.flickr.com/photos/andidfl/229169559/ - slide 16