Download 16.1 Human Population Growth And Natural

16.1Air
Human
16.2
Quality Population Growth And Natural
Resources
Pollutants accumulate in the air.
• Smog
– sunlight interacts with
pollutants produced by fossil
fuels
– Harmful to human health.
16.1Air
Human
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Quality Population Growth And Natural
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• Acid rain
– pollutants in the water cycle cause rain pH to drop
– can lower the pH of a lake or stream
– can harm trees
16.1Air
Human
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Quality Population Growth And Natural
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Thinning Ozone Layer
O3
• Naturally occurring
• Screens out most ultraviolet radiation from the sun
• Unstable reactive gas
• Pollutant in the lower atmosphere
• Responsible for odor during lightning storms
Hole in ozone layer over Antarctica
1% of UV radiation gets through
• Responsible for all sun-burns and half-million skin cancer
cases each year
16.1 Human Population Growth And Natural
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16.2
Quality Population Growth And Natural
16.1Air
Human
Resources
Greenhouse Effect
CO2 & water vapor reflect heat back towards the earth
Insulates Earth from the deep freeze of space
Fossil fuels are burned = give off CO2
• Increased by 25% in the last 100 years
Increases avg. global T
16.1Air
Human
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Quality Population Growth And Natural
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• Rise in sea levels (melting glaciers)
• Natural cycle of the earth
North Pole
16.1 Human Population Growth And Natural
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• http://www.youtube.com/watch?v=6hFxG-8I0Go
16.1Threats
Human
Population Growth And Natural
16.4
to Biodiversity
Resources
Preserving biodiversity is important to the future of the
biosphere.
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Population Growth And Natural
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to Biodiversity
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Loss of habitat = eliminates species.
• Habitat fragmentation
– occurs when a barrier forms within the habitat
– often caused by human development
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Human
Population Growth And Natural
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to Biodiversity
Resources
• Habitat corridors = solution
– allow species to move between different areas of
habitat
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Human
Population Growth And Natural
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to Biodiversity
Resources
Introduced species is one that is brought to an ecosystem
by humans.
– accidental
– purposeful
• Can have an
environmental
and economic
impact.
16.1Threats
Human
Population Growth And Natural
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to Biodiversity
Resources
• Invasive species often push out native species.
– Burmese python (Florida Everglades)
16.1 Human Population Growth And Natural
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KEY CONCEPT
As the human population grows, the demand for
Earth’s resources increases.
16.1 Human Population Growth And Natural
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Exploding Human Population
Increasing population requires increasing amounts of
• Food
• Space for waste
• E
20% of world’s population live in developed countries
80% live in developing countries
• Populations are growing much faster
16.1 Human Population Growth And Natural
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16.1 Human Population Growth And Natural
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Earth’s human carrying capacity is unknown.
16.1 Human Population Growth And Natural
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• Technology has helped to increase Earth’s carrying
capacity.
– farm equipment
– medical advancements
16.1 Human Population Growth And Natural
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Nonrenewable resources are used faster than they form.
• Coal
• oil
16.1 Human Population Growth And Natural
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• Renewable resources
– wind
– water
– sunlight
• Resources must
be properly
managed.
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16.1Conservation
Human Population Growth And Natural
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Sustainable development meets needs without hurting
future generations.
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16.1Conservation
Human Population Growth And Natural
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Conservation practices focus on a few species but benefit
entire ecosystems.
• The Endangered Species Act
works to protect individual
species from extinction.
• A listed species is often called an
umbrella species.
– the habitat in which the
species lives must be
protected
– other species are protected
because they share the
ecosystem
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16.1Conservation
Human Population Growth And Natural
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The Environmental Protection Agency (EPA) was created
in 1970.
• develops policies and regulations to protect the
environment.
– Clean Air Act
– Clean Water Act
– Endangered Species Act
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16.1Conservation
Human Population Growth And Natural
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• The National Park Service
helps manage public
lands.
• The park system includes
over 390 areas, covering
84 million acres.
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Human Population Growth And Natural
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• There are several ways that people can help protect the
environment.
– control population growth
– develop sustainable technology and practices
– protect and maintain ecosystems