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Chapter 6: Humans in the Biosphere

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Presentation on theme: "Chapter 6: Humans in the Biosphere"— Presentation transcript:

1 Chapter 6: Humans in the Biosphere
Changing Landscapes

2 Effects of Human Activity
Agriculture Monoculture Idea of planting a single crop year after year Problems: Pollutes the soil and water (How?) Wastes fossil fuels Drains the soil of nutrients

3 Effects of Human Activity
Housing Problems: Increase in population density leads to more waste If not treated properly, land, air, and water pollution Divides environment Destroys animals habitats

4 Effects of Human activity
Industrial Growth Problems: Depletion of fossil fuels Needed for machines to conduct work Environmental harms Dumping of toxic waste

5 Sustainable Development
Renewable Resource Resources that can be replaced or produced in a healthy ecosystem Must be done in reasonable amount of time Examples? Nonrenewable Resource Resources that can’t be produced by a natural process in a reasonable amount of time Examples?

6 Chapter 6: humans in the biosphere
Using Resources Wisely

7 Soil Resources Erosion Desertification
Losing soil due to over farming, drought, or climate change Example Dust Bowl 1930’s All 3 problems occurred at the same time Soil could be found hundreds of miles off coast of New York Deforestation Destruction of forests Problems: Tree roots help hold soil together and nutrients Removing trees causes these things to be lost

8 Soil resources Methods of sustainability
1. Leave behind roots and stems in soil 2. Crop rotations Planting different crops each season Helps maintain nutrient levels in soil 3. Contour Plowing Plant crops across the slopes of land instead of down the slope Reduces the amount of water runoff 4. Cut down mature trees only

9 Freshwater resources Water Pollution Point source
Exact location of water pollution Caused by an oil spill or factory dumping Non-point source Water pollution that occurs due to dumping in a different location Caused by runoff into water sources Biological Magnification Can be linked to snowball effect As you move up through the trophic levels, higher concentrations of substances can be found in organisms

10 Atmospheric resources
Air Pollution Smog Chemical reaction of air pollutants Result from car exhausts and factory chemicals Acid Rain Results from air pollution caught up in clouds Rain caused destruction to plants Pollutants can ruin the soil as well Greenhouse Gases Gases occur naturally Pollution causes for increase of them which causes higher temperatures Particulates: Ash and Dust (Harmful if swallowed)

11 Chapter 6: Humans in the biosphere

12 Types of Biodiversity Biodiversity: Total variety of organisms in the biosphere 1. Ecosystem diversity Different ecosystems in the biosphere Can be thought of as the different biomes 2. Species diversity Number of species on the planet 1.8 million discovered already 30 million undiscovered 3. Genetic diversity All forms of genetic information in each species

13 Uses of biodiversity Medicine Used to treat disease
A large number of plants in rain forest have been tested against types of cancer Agriculture Domestic plants have wild relatives We can use genes from each plant to create pest resistant plants or better plants

14 Threats to biodiversity
Altered Habitats Fragmentation Splitting of an ecosystem When cities built in ecosystems Creates competition Can lead to extinction of species Hunting Over hunting can lead to endangered species Endangered species struggle to do their job in environment

15 Threats to biodiversity
Introduction of new species Bringing in of a new species can create unbalance Leads to other species leaving and destruction of ecosystem Pollution Lowers biodiversity Poor conditions leads to lower birthrates Climate Change Species adapted to a specific climate and environment When climate changes, survival becomes difficult

16 conservation Zoos Allows for humans to save species
Introducing captive breeding Enlarge population through breeding in zoos Release in wild slowly National Parks Protect areas of land from deforestation Gives species habitats that have been lost

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