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Global Warming
Slide Show Project
Justin Reed
Grade 10 Applied Science
2012
Global Warming
Vs
Climate Change
Greenhouse Gases
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Many greenhouse gases (GHG) occur naturally
including water vapour (H2O), carbon dioxide
(CO2), methane (CH4), nitrous oxide (NOx), and
ozone (O3).
Basically, GHGs trap heat in the Earth's
atmosphere. GHGs are vital to life on Earth (i.e.,
temperature would be 30OC colder without the
natural Greenhouse Effect).
If too much GHGs is added to the atmosphere,
more heat gets trapped and the Earth becomes
too warm. This is Global Warming
Many human activities add to the natural effects
of the gases, and many people believe human
emissions of the GHGs are the main cause of
Global Warming
Climate Change
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Climate Change is a natural and reoccurring
process in weather patterns over periods ranging
from decades to millions of years.
Climate Change may be limited to a specific
region or may occur across the whole Earth.
It may be a change in average weather patterns
or a distribution of more or less extreme weather
events across the Earth.
Is Global Warming
a Myth?
Carbon Levels
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CO2 is the chief GHG that results from
human activities and causes global
warming and climate change.
Carbon concentrations in the atmosphere
are rising fast from decade to decade
mainly due to human activities.
The upper safety limit for Atmospheric CO2
is 350 parts per million (ppm).
Atmospheric CO2 levels have stayed
higher than 350 ppm since early 1988.
Rising Temperatures
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Since agriculture began, the earth's climate has
been remarkably stable. Now the earth's
temperature is rising.
This rise in heat comes from heat trapping gasses
principally CO2 in the atmosphere. The rise
mainly comes from two sources: (1) burning of
fossil fuels and (2) deforestation.
Each year, more than 6 billion tons of carbon are
released into the atmosphere when fossil fuels
are burned. The estimates on deforestation are
around 1.5 billion tons of carbon are released.
The outcome has been rising temperatures on
Earth (see graphs on the next page)
Charts and Stats