1. Overpopulation

2. The Greenhouse Effect G.H.E. is naturally good (it warms Earth)
Problem: Excess heat trapped near the earth’s 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

3. What’s a Greenhouse?
A Greenhouse is designed to trap heat so you can grow plants year round, even in cooler environments.
heat
Some heat escapes the greenhouse, but enough is trapped to keep the inside warm
heat
heat
heat

4. Earth Some heat escapes into space heat
Some heat naturally trapped by Earth’s atmosphere
The Natural Greenhouse Effect is good!
heat
heat
Earth
The Atmosphere

5. CO2, Methane, other greenhouse gases
Earth

6. Earth Less heat escapes into space heat heat heat
More heat trapped near Earth’s surface
heat
heat
Excess CO2 in atmosphere
Earth

7. 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 20⁰F.
Heat is trapped by the thick CO2 atmosphere. Temperatures reach 750⁰F.
Average global temperature is 57⁰F.

8. Acid Rain 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: toxins accumulate in living tissue higher up the food chain
Solutions:
Reduce fossil fuel usage
Add buffer (base) to waterways
Acid Rain

9. Biomagnification
Acid rain
Pesticide runoff
Fertilizer runoff
Mercury

11. Nitric acid
Sulfuric acid
SO2 NO NO

14. Ozone layer blocks UV radiation from the sun
Ozone Layer Depletion
Ozone Function: Block UV radiation from sun
Problems:
CFCs thinning the ozone layer
CFCs common to coolants and foam production
More UV radiation reaches the surface
Effects: Crop damage, skin cancers, Eye damage
Solution: Reduce CFCs, regrow trees UV UV
Ozone layer blocks UV radiation from the sun
Ozone layer
CFCs

15. Argh!!!!

16. 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

17. When is ozone good vs. bad?
When Good
When Bad
When miles up in the atmosphere
It blocks UV radiation from the sun
Life doesn’t exist in the stratosphere
When near the ground
Where life exists

18. Deforestation Defined: Clearing of forested areas Reasons: Problems:
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

21. 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

22. 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

24. Lessons from China 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

25. Kobe Kuiz
CFCs are manmade chemical responsible for the destruction of _________________.
Which gas is a main contributor to the greenhouse effect?
Crop damage and cancers are caused by an excess amount of which type of energy?
Name the big three fossil fuels.
Which planet has excess temperatures because of a thick CO2 atmosphere?
Desert-like land is created as a result of which problem?
Where is ozone gas harmful to life?
Where is ozone gas helpful to life?
Food webs become unbalanced as a result of the introduction of which type of organisms?
Even though there may be space for people, why do those who study the environment consider humans to be overpopulated?