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Transcript 
GLOBAL WARMING AND
OZONE DEPLETION
Agenda



Continuation from yesterday
Independent Practice
Articles & Follow Up Questions
The Greenhouse Effect

The gases in the atmosphere that absorb the reradiated infrared
radiation are known as greenhouse gases.
 Water vapor, carbon dioxide, and methane are some examples.
The Greenhouse Effect


The energy from the absorbed radiation heats the gases in
the air. These gases form a “blanket” around Earth that
holds heat in the atmosphere.
The process by which gases hold heat in the air is called the
greenhouse effect.
The Greehouse Effect
The Greenhouse Effect


In a greenhouse, the
glass allows short
wavelength radiation
to enter,
but does not let long
wavelength (infrared)
radiation to escape.
Greenhouse Effect
Analogy…foiling hot food
What does the Greenhouse Effect do?


The greenhouse effect is a natural process that keeps Earth’s
atmosphere at a temperature that is comfortable for most
living things.
Were it not for the greenhouse effect, Earth would be
approximately 33C colder than it is.
Global Warming



Human activities that add greenhouse gases to the
atmosphere may be warming Earth’s atmosphere.
The burning of wood, coal, oil, and natural gas adds
carbon dioxide to the air.
The increased carbon dioxide can trap heat and the result
could be global warming.
 Global warming is a gradual increase in the
temperature of Earth’s atmosphere.
Effects of Global Warming
Ozone Depletion
Ozone Depletion



In the 1970’s, scientists noticed that the ozone layer over
Antarctica was growing thinner.
Chemicals produced by humans have been damaging the
ozone layer.
The main cause of ozone depletion is a group of chlorine
compounds called chloroflourocarbons, or CFCs.
 CFCs are destroying the ozone layer
Ozone Depletion
Ozone Depletion Effects



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Skin cancer increases
Sun burns
Eye problems
Malaria
Infectious Disease
Independent Practice

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Complete practice questions
Read articles 1 and article 2
Answer questions that pertain to each article
HOMEWORK IF NOT FINISHED IN CLASS!
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