2. Ozone Holes – Page 457 Global Warming – Page 649 Acid Rain – Page 481

11. Acid Rain Caused by acid SO2

12. SO 2 Comes From Volcanic gases Forest fires Bacteria Industrial processes Fossil fuel combustion

13. Amounts released 30 million tons of SO 2 released by U.S. yearly 15 –30 million tons released by Mt Pinatubo

14. Coal is a major source of SO 2 Eastern coal is high sulfer & higher BTU’s Western coal is low sulfer & lower BTU’s Must burn more west coal to get same energy as East So which is better???

15. Acid Rain Chemistry

16. Problems with Acid Rain Lowers the pH of rivers and lakes this kills, fish animals and plants Dissolves metals, marble and limestone

17. Scrubber Chemistry If CaCO 3 is placed in the smoke stack, much of the SO 2 is removed