Transcript Renewable & Non-renewable Resources

Renewable & Non-renewable
Resources
WCPSS
8th Science
Natural resources
• A natural resource is any energy source,
organism, or substance found in nature
that people use
• There are four parts:
– Atmosphere: the source of the air we breathe
and weather
– Hydrosphere: includes all the Earth’s water—
lakes, rivers, oceans, and underground water
– Biosphere & Geosphere: the sources of all
food, fuel, clothing, and shelter
3 Categories of Resources
• Renewable resources: natural resources
that can be replaced in nature at about the
same rate that it can be used
• Non-renewable resources: natural
resources that exist in a fixed amount or
the supply will be used up faster than it
can be replaced in nature
• Inexhaustible resources: resources that
will never run out
Renewable Resource
Examples
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Trees and other plants
Animal waste
Biomass
Water (hydroelectric)
• These resources are considered
sustainable because continue to
regenerate at the same rate they are used.
Non-renewable Resources
Examples
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Nuclear energy
Coal
Oil
Natural gas
Minerals and Rocks (ex. copper)
• Coal, oil, and natural gas are considered fossil
fuels, which are formed from ancient plants and
animals buried deep in the Earth’s crust for
millions of years. The high pressure and heat
change it chemically into these resources.
Inexhaustible Resources
Examples
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Wind
Solar
Geothermal
Tidal energy
Conservation
• Conservation means protecting, restoring,
and managing natural resources so that
they last as long as possible.
• Reduce-Reuse-Recycle!
Reduce
• Reduce: to make something smaller or use less,
resulting in a smaller amount of waste
• Source reduction is reducing waste before you
purchase an item or purchasing items that are not
wasteful in their packaging.
• Select items that do not have to be added to
landfills.
• What are some things you can do to reduce:
– Buy products in packages that can be easily recycled
– Avoid single-serve products, like water bottles
– Refuse plastic store (grocery) bags
Reuse
• Reuse materials in a their original form
• What can you do?
– Use travel mugs to get drinks at restaurants and
corner stores
– Wash and reuse plastic utensils, cups, plates and
food storage bags instead of throwing away after
one use
– Instead of ripping off gift wrap, carefully remove it
and reuse it later
– New is not always better: repair broken items like
bicycles, washers, dryers, refrigerators
Recycle
• Don’t just throw everything away!
• Many items can easily be recycled:
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Aluminum cans (soda cans)
Glass bottles
Paper
Cardboard
Metals
Electronic equipment
• Check out this website to see what you can
recycle:
http://www.wakegov.com/recycling/Pages/default.
aspx
Why conserve resources?
• We use a lot of fossil fuels, which are nonrenewable
resources.
• We need to shift our use to renewable or inexhaustible
resources instead because nonrenewable resources will run
out and are being rapidly depleted by the human populations.
• Electricity comes from nuclear power or coal power plants and
cars use petroleum (oil);all three are nonrenewable and will
eventually run out.
• When fossil fuels are burned, they give off excess carbon
dioxide, air pollution, acid rain and global warming.
• Other negative influences of fossil fuels include oil spills and
water pollution, loss of wilderness areas, construction of new
power plants, foreign energy dependence and the risk of
international conflict over energy supplies.
Reduce Nonrenewable
Dependence
• Resource depletion: eventually these
nonrenewable resources will disappear
• Save money!: use fluorescent bulbs, solar
electricity which are expensive at first but pay back
• Reduce carbon dioxide emissions: this will help
people who suffer from respiratory illnesses like
asthma
• Acid rain: power plants and automobiles emit
sulfur dioxide and nitrous oxides, which when
mixed with water vapor can become acid rain; acid
rain is harmful to marine life, lungs in people, trees
and crops and soil as well as properties.
Resources
• Inexhaustible Resources: http://inexhaustibleresources.org/
• Reduce-Reuse-Recycle: http://kids.niehs.nih.gov/explore/reduce/
• Wastes—Resource Conservation:
http://www.epa.gov/epawaste/conserve/
• Earth’s History & Resources; Science 8; McDougal-Little; ©2005
• Why conserve energy? http://www.conserve-energyfuture.com/WhyConserveEnergy.php
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