1. Human Impact on Resources Fill in your notes as we go!

2. Demands on Resources All organisms use resources to live All organisms use resources to live As populations increase, their demand for resources also increases As populations increase, their demand for resources also increases

3. Population Growth Exponential Growth: population grows without limits Exponential Growth: population grows without limits –First stages of growth –Population grows very quickly Carrying Capacity: the amount of organisms an area can hold Carrying Capacity: the amount of organisms an area can hold –Population runs out of resources –Stops growing

4. Human Impact on Land Resources Mining: disturbs large areas of Earth’s surface Mining: disturbs large areas of Earth’s surface Agriculture: causes habitat loss, erosion, and water pollution Agriculture: causes habitat loss, erosion, and water pollution City development: causes habitat loss, erosion and pollution City development: causes habitat loss, erosion and pollution

5. Reducing the Impact on Land Construction barriers to prevent erosion Construction barriers to prevent erosion Protected areas where developers cannot build Protected areas where developers cannot build Carefully constructed landfills Carefully constructed landfills Cleaning up toxic waste Cleaning up toxic waste

6. Human Impact on Air Resources Human activities create air pollution Human activities create air pollution Air pollution can cause human health diseases Air pollution can cause human health diseases –Examples: asthma, lung cancer and lung disease

7. Types of Air Pollution Acid Precipitation: sulfur dioxide and nitrogen oxides combine to make sulfuric and nitric acid Acid Precipitation: sulfur dioxide and nitrogen oxides combine to make sulfuric and nitric acid Global Warming: Carbon dioxide builds up in the atmosphere causing a rise in the Earth’s temp Global Warming: Carbon dioxide builds up in the atmosphere causing a rise in the Earth’s temp Ozone depletion: Chlorofluorocarbons (CFCs) caused a hole in the ozone layer Ozone depletion: Chlorofluorocarbons (CFCs) caused a hole in the ozone layer

8. Human Impact on Water Resources Water pollution is caused by: Water pollution is caused by: –Improper disposal of sewage and toxic waste –Dissolved pesticides and fertilizer –Runoff of oil, gasoline and other chemicals

9. Reducing the Impact Clean Air Act: US law designed to decrease air pollution Clean Air Act: US law designed to decrease air pollution The Safe Drinking Water Act and The Clean Water Act: US laws to decrease water pollution The Safe Drinking Water Act and The Clean Water Act: US laws to decrease water pollution