1. KEY CONCEPT Fossil fuel emissions affect the biosphere.

2. Pollutants accumulate in the air.
Pollution is any undesirable factor added to the air, water, or soil.
Smog is one type of air pollution.
sunlight interacts with pollutants in the air
pollutants produced by fossil fuel emissions
made of particulates and ground-level ozone

3. Smog can be harmful to human health.
Acid rain is caused by fossil fuel emissions.
produced when pollutants in the water cycle cause rain pH to drop
can lower the pH of a lake or stream
can harm trees
can harm us if particulates are inhaled

4. Air pollution is changing Earth’s biosphere.
The levels of atmospheric carbon dioxide rise and fall over time.
High levels of carbon dioxide are typical of Earth’s warmer periods.

5. sunlight penetrates Earth’s atmosphere
The greenhouse effect slows the release of energy from Earth’s atmosphere.
sunlight penetrates Earth’s atmosphere
energy is absorbed and reradiated as heat
greenhouse gases absorb longer wavelengths
Greenhouse gas molecules rerelease infrared radiation
methane (CH4)
water (H2O)
carbon dioxide (CO2)

6. What is greenhouse gas and the green house effect?

7. The Greenhouse Effect
G.H.E. is naturally good (it warms Earth)
Problem: Excess CO2 absorbs excess heat near the earth
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

8. What’s in a name?
The purpose of a greenhouse is to trap heat year round

9. Earth

10. Earth

11. Earth

12. The Greenhouse Effect

13. The Greenhouse Effect in our solar system
Venus: The Extreme Greenhouse Effect
Mars: No Greenhouse Effect
Earth: Balanced Greenhouse Effect
Little heat is trapped by the thin CO2 atmosphere. Temperatures can be around 20 F.
Heat is trapped by the thick CO2 atmosphere. Temperatures reach 750 F.
Average global temperature is 57 F.

14. Global warming refers to the trend of increasing global temperatures.
North Pole