1. GREENHOUSE EFFECT

2. definition Sun’s rays are trapped by greenhouse gases in troposphere
Heat is trapped like a greenhouse

3. Is this bad? Need greenhouse effect to warm earth But…
Too much heat creates global warming

4. EARTH Without Greenhouse Effect: 32º F With Greenhouse Effect: 57 º F
Mars- too little
Venus- too much

5. Enhanced Greenhouse Effect
Human contribution to Greenhouse Gases

6. GHG Greenhouse gas Any gas the traps in heat Examples:
Water vapor methane (CH4)
CO2 nitrous oxide (Nox)

7. Greenhouse gas producers

8. GWP- global warming potential
relative measure of how much heat a greenhouse gas traps in the atmosphere.
Compared to CO2

9. Fossil fuels? Coal Oil (petroleum) Natural gas electricity Gasoline
plastics
Natural gas
heating

10. Why are fossil fuels “bad”?
Produce carbon dioxide

12. Are we warming?

13. Rising sea level by 2080 (projected)

14. Earth’s climate has always been changing
7/19/2018

15. PALEOCLIMATES
Ancient climates
7/19/2018

16. How do we study past climates???
7/19/2018

17. Fossils- to tell climate millions of years ago
Certain critters only live in WARM climates
Trilobites
Corals (Petoskey stones)
dinosaurs
7/19/2018

18. Ice cores- to tell climate 100,000+ years ago
Ancient air bubbles are trapped in the ice
Can analyze ancient air, look at CO2!
18O/16O- seen in actual ice
More 18O in ice than 16O= hotter
Tells ancient temp.
7/19/2018

19. 7/19/2018

20. Tree rings- tell climate hundreds of years ago
Wider rings represent warm wet climate
7/19/2018

21. Jan. 10, 2017