chapter 27 – human impacts on earth resources
Post on 22-Feb-2016
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Chapter 27 – Human Impacts on Earth Resources
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
Asian Carp
• Carp 1• Carp 2
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
J-shaped Curve
• Normally, a growing population can be shown by a J-shaped curve
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
S shaped curve
Carrying capacity
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
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
Solutions
• Developers put barriers around new construction
• Modern landfills
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