1. White Sands – NM
Gypsum sand

3. Lake Lucerno
Gypsum crystals

5. GROUP QUESTION
The Gypsum dunes in White sands constantly migrate NE, but never leave the park. How does this happen?

6. How do Earth’s homeostatic systems work?
… and how delicate is the balance?

7. OZONE

9. CFC’s – Chlorofluorocarbons
– “inert” refrigerants and propellants

10. Ozone has decreased globally by 3% over past 20 years
by 7% over 40 years in Australia

11. … and by 50% over past 25 years in Antarctica

13. Individual PRS
How is the decrease in stratospheric ozone related to global warming?
Ozone destroys greenhouse gases
Ozone is produced by burning fossils fuels
Ozone can be used to make Oxygen
Glaciers trap large amounts of ozone
They were both noticed at the same time

15. What, if anything, have we done to reduce stratospheric ozone depletion?

16. Global Warming
and greenhouse gases

21. Kyoto Protocol – negotiated 1997-1998
-- went into effect Feb after being ratified by Russia
-- would result in dropping GHG emissions below 1990 level
by 2012

23. What, if anything, will you do to reduce GHG emissions?
Do you think the government needs to get involved and, if so, how?
If we were to hold our rate of GHG production to 1990 levels, what climatic results would you expect?