1. Human Impact on Ecosystems

2. OBJECTIVES…I can…
Identify the causes and effects of having excess greenhouse gases in the atmosphere.
Identify alternative energy sources.
Identify the causes and effects of depletion of the ozone layer.
Identify the causes and effects of acid precipitation.
Define biodiversity and explain its value.
Identify current threats to biodiversity.
Describe the goal of conservation biology.

3. Impact on Land Pollution Loss of topsoil due to erosion
(less topsoil = less food)
Deforestation – clear-cutting of forests

4. B. Impact on Water Pollution
Acid rain – caused by factory emissions, changes the pH of ecosystems which causes organisms to die

5. C. Impact on Air Pollution
Global Warming / Climate Change– caused by the Greenhouse Effect which is caused by excess CO2 from burning fossil fuels.

6. Air – continued
Ozone Depletion – CFC’s from aerosal spray cans destroy the protective ozone layer causing increased radiation from the sun to reach the earth, resulting in more skin cancers

8. CFU
What are the causes and effects of global warming and ozone depletion?

9. D. Impact on Living Organisms
Invasive or introduced species – non-native species “take over” due to no natural enemies
Less biodiversity = less variety of living things
Habitat destruction

10. Impact on Living Organisms – con’t
Biological magnification – There are increasing concentrations of harmful substances in organisms at higher tropic levels.

12. What Can We Do?
Reduce what we use.
Reuse things.
Recycle materials.

13. What’s Your Footprint on the Earth?