1. Chapter 27 – Human Impacts on Earth Resources

2. Resources and Organisms
The oxygen you breathe in and the carbon dioxide you exhale are examples of natural resources you use everyday
Most organisms have adapted to their particular environment and live in balance with it
Other organisms change the environment to meet their needs
Some positive, some negative

3. Asian Carp

4. Carp 1
Carp 2

5. Resources and Population Growth
Any type of organism can have an impact if the population becomes too large
As population grows, the demand for resources increases
Population growth is defined as an increase in population size over time

6. J-shaped Curve
Normally, a growing population can be shown by a J-shaped curve

7. Limits to Population Growth
Earth’s resources are limited, so population cannot grow forever
Limiting factors can be: food, water, or clean air
Number of organisms an environment can support is its carrying capacity

8. S shaped curve
Carrying capacity

9. Environmental Factors
Storms, extreme changes in temp, droughts, floods and pollution can all affect population size
Disease, parasites, and lack of food can also affect it

13. Urban Development
70% of the North American population live in either urban or suburban areas
Development of land or new construction can cause environment problems
Destroys old habitats
Development also takes away from farmland and adds pressure to remaining farmland
Increase chance of flooding because of increase of asphalt and concrete
Increase in solid waste

15. Solutions Developers put barriers around new construction
Modern landfills