1. GREENHOUSE EFFECT
Is it getting warmer?

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

3. Is this bad? Not all Need greenhouse effect to warm earth But…
Too much heat creates global warming (enhanced greenhouse effect)

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
Review: What gases make up the atm.?

7. Greenhouse gases Water Vapor H2O Sources (natural) Concentration
evaporation
volcanoes
Concentration
1-3 ppm
Lifetime
A few days
GWP= na

8. But…. Co2 is the biggest man-made greenhouse gas

9. Greenhouse gases Carbon dioxide- CO2 Sources Concentration Lifetime
Burning fossil fuels
Deforestation (trees use Co2)
Cement production
Concentration
379 ppm (largest man-made contributor)
Lifetime
varies
GWP= 1

10. What do we use fossil fuels for?
Coal
electricity
Oil
Gasoline
plastics
Natural gas
heating

11. Greenhouse gases Methane CH4 Sources Concentration Lifetime GWP= 23
Agricultural waste
Fossil fuels
Land fills
Concentration
1.77 ppm = 1770 ppb
Lifetime
12 years
GWP= 23

12. Greenhouse gases Nitrous Oxide N20 Sources Concentration Lifetime
Fertilizers
Combustion of ff
Concentration
.319 ppm = 319 ppb
Lifetime
114 years
GWP= 296

13. Greenhouse gas producers

15. GH gases and climate graph

16. Are we warming?

17. Rising sea level by 2080 (projected)