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Chapter 6.2 and 6.3 Humans in the Biosphere

Chapter 6.2 and 6.3 Humans in the Biosphere. Bell Ringer: Describe Sustainable Development. Soil. Healthy soil supports both agriculture and forestry. Good topsoil is rich in nutrients and absorbs and retains water, but still drains.

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Chapter 6.2 and 6.3 Humans in the Biosphere

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  1. Chapter 6.2 and 6.3 Humans in the Biosphere Bell Ringer: Describe Sustainable Development.

  2. Soil • Healthy soil supports both agriculture and forestry. • Good topsoil is rich in nutrients and absorbs and retains water, but still drains. • Poorly managed farming in 1930’s led to the dust bowl = desertification. • Is topsoil renewable? • Crop rotation, contour plowing • Deforestation leads to erosion. EX rainforest soil is thin and becomes wasteland. • Tree farms and selective harvesting

  3. Freshwater Pollution • Pollutant- harms biosphere. EX? • Primary source of water pollution is • industrial and agricultural chemicals = Biological magnification. • residential sewage (N & P) = algae blooms remove O. , disease – artificial eutrophication • Sustainable water? • Protect watersheds, pollution control, conservation

  4. Atmospheric Resources • Pollution • Smog from factories/vehicles • Acid rain = nitrogen and sulfur combine with water vapor • Kills plants • Change chemistry of soils & surface water • Damage statues • Why is sustainability difficult for air quality? • What to do?

  5. Biodiversity • Total of variety of organisms (genetically too) • What do you think more biodiversity indicates? • Why is biodiversity important? • Medicine, agriculture, ecosystem sustainability • Threats • Humans alter habitats (fragmentation), poaching, invasive species, pollution, climate change. • How to protect it? • Protect species, preserve habitats, humans benefit from conservation (tax credit).

  6. Introduced/Exotic/Nonnative/Nonindigenous VS Invasive Species • What? plants, animals, or microscopic organisms living outside their native range. • How? • Introduced: historically living outside of native range and have evolved to live in area. • EX: coho, chinook, and pink salmon are favored nonindigenous sport fish in the Great Lakes, Invasive: • Invasive: Species that takes over an area with no natural control and threatens the ecosystem • EX: Zebra mussel in the Great Lakes

  7. Ecological Footprint • What is it? • Describes total area of functioning land and water needed to provide resources for individuals and make harmless the wastes they generate. • Energy, food, water, shelter, sewage, greenhouse gases America= 4 x larger than global average.

  8. How can ecology guide us toward a sustainable future? • 1. recognize problems in environment • 2. research problem to determine cause • 3. use scientific understanding to change our behavior, we can have a positive impact on the global environment.

  9. Worksheet Q’s • Worksheet B packet

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