1. Pollution
Ecology

2. Human Population Growth
Before the industrial revolution, the size of the human population was stable
After the revolution, the human population grew significantly

3. Resources The larger the population, the more resources are required
The are two types of resources
Renewable resource – one that can be relatively quickly replaced or recycled naturally
Trees, air, water, soil, etc
Non-renewable resource – one that cannot be replaced by nature as fast as it is being consumed
Oil, coal, natural gas and some metals

4. Pollution
Pollution is the addition of substances to the environment that damage it, making it undesirable or unfit for life
The substances that cause pollution are called pollutants

5. Air Pollution
Mainly from incomplete burning of fossil fuels e.g. coal, oil, and wood
May be due to
Human Activities
Exhaust from motor vehicles
Factories
Burning of garbage
Use of CFCs in foam packaging
Natural occurrences
Biological decay
Forest fires
Volcanic eruptions  All three release ammonia into the air
Results:
Increase in disease – decrease in health

6. Acid Rain
Cause:
Burning of fossil fuels releases toxin into the atmosphere
Effects:
Can destroy forests, poison lakes, kill wildlife, erode statues and buildings

7. Acid Rain Effects of Acid Rain:
Dissolves aluminum salts in soils and washes them into rivers and lakes
Death of fish in lakes and rivers because of high salt concentration/acidity

8. Effects of Acid Rain

9. Greenhouse effect Cause: Effects:
Burning of fossil fuels and losing forests increases the amount of gases in the atmosphere that trap heat
Effects:
Changes in climate,
melting of polar ice
caps, drought,
flooding

10. Ozone Depletion Cause:
Use of certain chemicals like chlorofluorocarbons (CFCs)
Non-toxic unreactive chemicals
Used as:
Aerosol propellants
Cooling agents (fridge and air conditioning)
Foam packaging
Results:
Break down the ozone layer allowing more UV rays to penetrate Earth Increase risk of skin cancer

11. Soil Degredation Causes: Effects:
Soil erosion and pesticides threaten quantity and quality
Effects:
Threats to agriculture and organisms that live in the soil
Bioaccumulation of pesticides to higher trophic levels

12. Habitat Destruction Causes: Effects:
Poisoning lakes and destroying forests and other areas for wood, homes, etc.
Deforestation – removal of all the trees in a forest for lumber, farms, mines and urbanization
Effects:
Threatens species living
there, upsets the balance
of nature (carbon cycle)

13. Water Pollution Causes: Effects:
Waste, trash, chemicals etc. contaminate rivers, lakes, oceans
Effects:
Threat to species that live in water, less clean water for drinking, farming, etc.

14. Let’s keep our planet clean 