1. Humans in the Biosphere Chapter 6

2. Humans in the Biosphere All organisms share a limited resource base We all rely on natural ecological processes that sustain resources energy flow, cycles, climate, limiting factors

3. Human Activities Hunting and Gathering Agriculture Industry and Urban Development

4. Hunting and Gathering May have caused some extinctions Still in practice today

5. Agriculture The practice of farming Started 11,000 years ago Produce and store large quantities of food Stable communities formed

6. Agriculture Monoculture Farming strategy in which large fields are planted with a single crop, year after year

7. Agriculture Green Revolution Increased the world’s food supply

8. Agriculture Problems? Pesticides Water supply

9. Industry and Urban Development Life became better Growth of suburbs and cities Problems?

10. Renewable Resources Resources that can regenerate (alive) Cut down a tree, plant a new one to replace it Biogeochemical Cycles (nonliving) Still limited through overuse

11. Nonrenewable Resource Cannot recover through natural processes Fossil Fuel (coal, oil, natural gas) Change in ecosystem may cause renewable resources to become nonrenewable

12. Sustainable Development A way of using natural resources without depleting them Provide for us without causing longterm harm on the ecosystem Allow people to live comfortably but at the same time improve ecosystem insect use for insect control

13. Land Resources Soil can be permanently damaged Soil erosion plowing can wear away surface Desertification Overfarming, overgrazing, drought

14. Forest Resources Forests that take centuries to grow back are considered nonrenewable Deforestation Loss of forests Soil erosion and loss of nutrients Changes can prevent regrowth

15. Do Now 2/12/13 1. What does Renewable Resource mean? Give an example. 2. What does non-Renewable Resource mean? Give an example. 3. What is sustainable development? Give an example

16. Fishery Resources US National Marine Fisheries Service Created guidelines on number and size of fish allowed to be caught Aquaculture Raise aquatic animals for food Must be managed to prevent water pollution

18. Air Resources Smog large cities, due to car exhausts and industrial emissions Considered a pollutant - harmful Acid Rain Nitric and Sulfuric Acid

19. Freshwater Resources Renewable, but total supply is limited Conservation Need to protect natural systems involved in water cycle Forests and wetlands help filter water

20. Biodiversity Section 6-3

21. Biodiversity The variety of organisms considered at all levels, from populations to ecosystems Why learn about it? Our well being is tied to the well being of other organisms

22. Threats to Biodiversity Humans hunting to extinction polluting introducing foreign species habitat fragmentation - splitting of ecosystem

23. Pollution non biodegradable more concentrated when transferred up to each trophic level Biological problems in animals Biological Magnification opposite of Energy Transfer

24. Biological Magnification

25. Invasive Species If habitat is better than original, will grow rapidly Compete with others Achatina fulita

26. How to Protect Biodiversity Conservation Practices Wise management of resources Protections of wildlife and habitats Focus on hot spots - immediate danger of extinction due to human activity

27. Ozone Depletion Ozone absorbs a large amount of harmful UV rays CFC found to damage ozone 1 Chlorine atom can destroy 100,000 Ozone

28. Global Warming Increases in average temperature of the biosphere Found to have increased 0.6 degrees C since late nineteenth century

29. Evidence of Global Warming Natural cycle of climate change, or caused by human activity? Widely accepted hypothesis say human activity Scientists are still investigating and gathering data to make predictions Find ways to deal with climate change

30. "Isn't it a responsibility of scientists, if you believe that you have found something that can affect the environment, isn't it your responsibility to actually do something about it, enough so that action actually takes place? If not us, who? If not now, when?" -F. Sherwood Rowland