1. Global Issues 3.7-3.10

2. Ecological Problems

3. Problem: Biodiversity Crisis More species are going extinct now than in the past 100 thousand years

4. Problem: Habitat Destruction Habitat Destruction is the greatest threat to biodiversity

5. Problem: Invasive species Invasive species are moved by humans and thrive at the expense of other organisms

6. Problem: Overexploitation Harvesting of wild organisms at a rate greater than the population can replenish

7. Problem: Biocides Example: DDT (dichlorodiphenyltrichl oroethane) Human Action: –DDT kills insects Environmental Consequence: –Higher trophic levels began dying –(especially birds)

8. Problem: Nutrient Enrichment Human Action: –Fertilizers are added on farmlands Environmental Consequence: –Eutrophication: Excess Nitrogen and Phosphorus pollutes H 2 O Aquatic organisms die Florida coastline

9. Problem: Greenhouse Effect Human Action: –Combustion of fossil fuels produces CO 2 Environmental Consequences: –CO 2 in atmosphere increases –solar radiation is trapped by CO 2

10. Problem: Global Climate Change Global temperatures are increasing Polar ice caps are melting Sea levels will rise 1-13m After that who knows?

11. Ecological Solutions

12. Better Decisions Reduce, Reuse, Recycle Alternative fuels “Green” habits

13. Ecosystem services Ecosystem provides $33 trillion/year –Purification of air and water –Reduction of severity of natural disasters –Generation of fertile soils –Detoxification of waste –Pollination of crops

14. Conservation Research needs of organism Nature Reserves for biodiversity hot spots

15. Restoration Research the needs of the organism Rebuild suitable ecosystem –Habitat –Reintroduce Predators