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Environment and Resources

Environment and Resources. What is energy?. What do you think of? What is the definition? The ability to do work, or the cause of all activity. Natural Resources. Renewable- can be replaced by people or by the Earth Water, plants, animals, soil,etc .

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Environment and Resources

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  1. Environment and Resources

  2. What is energy? • What do you think of? • What is the definition? • The ability to do work, or the cause of all activity

  3. Natural Resources • Renewable- • can be replaced by people or by the Earth • Water, plants, animals, soil,etc. • Can be depleted faster than they are replenished • Renewal can be effected by human activities • replanting trees, wildlife preserves, clean air and water laws • oil spills, deforestation, over-building

  4. Non-Renewable Resources • The Sun- will run out….in about 5 billion years • Minerals formed in the Earth’s crust – millions of years to reform • Iron, gold, uranium, etc. • Recycling can help to delay the disappearance of these • Fossil Fuels- coal, oil, and natural gas • Formed from the remains of ancient plants and animals

  5. Energy Sources • Competition for resources has defined the survival of species. • This competition has become maybe THE strongest factor in politics and economics

  6. Fossil Fuels • Most nations depend heavily on oil • most do not have enough supply to match this demand and so must import. • Over 60% of the world’s supply of oil and natural gas • concentrated in a few countries in the Middle East and N. Africa

  7. The End of Oil • The world’s known oil reserves will only last another 50 years or so • There are unproven reserves, but tapping those sources may have environmental drawbacks • Natural Gas and Coal are also nearing the end. • About 200 years left for coal

  8. Nuclear Energy • Fission- splitting of uranium atoms in a nuclear reactor, releasing their stored energy • Pro’s • Does not pollute • Creates a great deal of energy • Cons • Leaks, explosions, and disposal of radioactive material • Refining uranium DOES pollute

  9. Can Nuclear energy be used? • Hope to find a way to generate energy through Fusion, the combining of atoms • No chance of meltdown, no pollution, waste is short-lived • Could provide energy for millions of years • Technology does not yet exist (Possibly by 2050)

  10. Other Energy Sources • Water • Falling water creates energy to move machinery • Oceanic tides can be used as well • Geothermal • Energy from the Earth’s internal heat creating steam • Hot springs and geysers would only last a few decades

  11. Solar • Converting the Sun’s rays to electricity • More technology is needed to make it practical • Wind • Clean, renewable resource • How much energy? • “noise pollution”

  12. Brainstorm • In what ways do you (or have you) used renewable resources?

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