Overpopulation

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Overpopulation
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Ozone Layer Depletion

• Ozone Function Block UV radiation from sun
• Problems
• 1) CFCs destroying ozone molecules in atmosphere
• 2) Ozone layer is thinning
• 3) More UV radiation reaches the surface
• Effects Crop damage, skin cancers, Eye damage
• Solution Reduce CFCs, regrow trees

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The Good and the Bad
The Bad
The Good
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The Greenhouse Effect

• G.H.E. is naturally good (it warms Earth)
• Problem Excess heat trapped near the earths
  surface
• Fear Climate patterns change, ice caps melt
• Main Cause CO2 from burning of fossil fuels
  (coal, oil, natural gas)
• Solutions Reduce use of fossil fuels, regrow
  trees, alternative energy sources

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Whats in a name?
The purpose of a greenhouse is to trap heat year
round
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Some heat escapes into space
heat
Some heat naturally trapped by Earths atmosphere
heat
heat
Earth
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Earth
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Less heat escapes into space
More heat trapped near Earths surface
Excess CO2 in atmosphere
Earth
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The Greenhouse Effect is naturally GOOD!
Mars No Greenhouse Effect
Earth Balanced Greenhouse Effect
Venus The Extreme Greenhouse Effect
Little heat is trapped by the thin CO2
atmosphere. High temperatures can be around 20F.
Heat is trapped by the thick CO2 atmosphere.
Temperatures reach 750F.
Average global temperature is 57F.
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Check Your Understanding

• CFCs are manmade chemical responsible for the
  destruction of _________________.
• 2) Which gas is a main contributor to the
  greenhouse effect?
• 3) Crop damage and cancers are caused by an
  excess amount of which type of energy?
• 4) Name the big three fossil fuels.
• 5) Which planet has excess temperatures because
  of thick CO2 atmosphere?

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Deforestation

• Defined Clearing of forested areas
• Reasons
• High demand for wood products
• Make area for farmland
• Problems
• Species extinction
• Excess CO2 released
• Desertification wind/rain carry soil away
• Solutions
• Recycle
• Improved farming techniques

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The Smog and Ground-Level Ozone

• Reason
• Burning of fossil fuels industry
• Problems
• Respiratory illness
• Ozone gas is poisonous
• Causes
• Particulates rise into air and react with
  sunlight to make air pollution
• Solutions
• Reduce use of fossil fuels
• alternative energy sources
• Plant trees

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Non-native Species Introduction

• Defined Foreign organisms are introduced to a
  new habitat
• Reason
• Pet industry, free ride organisms, pest control
• Effects
• Foreign species outcompete native species
• Food webs unbalanced
• Decrease biodiversity
• Economic damage
• Solutions
• Laws preventing foreign goods into new countries
• Introduce predators

Zebra mussels
Kudzu vines
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Check Your Understanding

• 1) Desert-like land is created as a result of
  which problem?
• 2) Where is ozone gas harmful to humans?
• 3) Food webs become unbalanced as a result of the
  introduction of which type of organisms?

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• Defined Precipitation with a below normal pH
• Cause
• Pollution from burning fossil fuels rises into
  the air
• Effect
• Waterways more acidic
• Kills plant and animal life
• Biomagnification
• Solutions
• Reduce fossil fuel usage
• Add buffer (base) to waterways

Acid Rain
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The Big Problem Overpopulation

• Over 6.7 billion people
• Many natural resources are nonrenewable
• Fossil fuels take millions of years to form
• More people means
• 1) More forests removed
• 2) More resources consumed
• 3) More CO2 released

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LessonsfromChina

• Encourage smaller families by
• 1) Free education for life to one child family
• 2) Free birth control
• 3) Financial Salary, Pension, Housing, Medical
• 1970s 5.8 children Today 1.8

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Quick Review

• Man made problems are endangering life on earth
• Environmental problems are due to human
  overpopulation
• Solutions are availableand up to us