Human Impacts

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Human Impacts

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  1. The Main Human Factors That Affect Climate

    Slide 1 - The Main Human Factors That Affect Climate

  2. Greenhouse Gases

    Slide 2 - Greenhouse Gases

    • Human activities send gases into the atmosphere
    • Many gases come from fossil fuels.
    • Too many gases in the atmosphere increases the Earth’s temperature
    • This Causes Global Warming !
  3. What is global warming?

    Slide 5 - What is global warming?

    • Increase in Earth’s temperature
    • Increased impacts on Earth
    • Temperature increase by 0.6C
  4. Human Impacts on the Environment

    Slide 6 - Human Impacts on the Environment

    • Global warming
    • Machinery use
    • One impact is coral bleaching
    • Rising water temperatures causes coral bleaching
  5. Carbon is Everywhere

    Slide 7 - Carbon is Everywhere

  6. Focus on CO2

    Slide 8 - Focus on CO2

    • CO2 has changed the most.
    • CO2 stays in the atmosphere a long time.
    • The US emits more CO2 than other greenhouse gases.
    • We can do something about it.
    • 800,000 Year Record of CO2 Concentration
  7. CO2 Example

    Slide 9 - CO2 Example

    • 25% more CO2 in the atmosphere
    • Biggest sources:
    • Burning fossil fuels
    • Cutting down forests
    • Burning trees
    • 2 to 5 billion metric tons
  8. This causes several problems

    Slide 10 - This causes several problems

    • Burning the timber increases the level of carbon dioxide in the air
    • Less trees means less carbon dioxide absorbed for photosynthesis
    • Soil is eroded as it is exposed to the wind and rain
    • Less water is transpired into the atmosphere
    • Many animal and plant habitats are destroyed causing extinction of species
  9. Land Use Change

    Slide 11 - Land Use Change

    • More people = more agriculture
    • More people = more homes
    • One example
    • More people affect the evaporation process
  10. Advancements in Agriculture and

    Slide 12 - Advancements in Agriculture and

    • Medicine
    • Larger human population
    • Increase in pollution
    • Demand for resources
  11. Intensive Farming

    Slide 13 - Intensive Farming

    • Farming has become more intensive to provide a higher % yield from land
    • Many people regard intensive farming of animals to be cruel
    • In order to produce more food from the land farmers have to use more fertilizers and pesticides
  12. Humans are using up the Earth’s resources, including fossil fuels.

    Slide 14 - Humans are using up the Earth’s resources, including fossil fuels.

  13. Results from Burning Fossil Fuels

    Slide 15 - Results from Burning Fossil Fuels

    • Cars and power stations
    • CO2 is trapped increasing heat
    • Weather changes
    • Weeds thrive while other plants do not
  14. Acid Rain

    Slide 16 - Acid Rain

    • Sulphur dioxide and nitrogen oxide will dissolve in rain producing Acid Rain
    • Acid rain damages trees and pollutes rivers and lakes.
    • Power plants release the most sulphur dioxide and nitrogen oxide
    • Trucks, cars, and buses also release sulphur dioxide and nitrogen oxide
  15. Altered Atmosphere

    Slide 17 - Altered Atmosphere

    • Greenhouse Gas
    • Pre-1750 Tropospheric Concentration
    • Recent Tropospheric Concentration
    • Change in Tropospheric Concentration
    • Carbon dioxide (CO2)
    • 280 ppm
    • 393 ppm
    • 40%
    • Methane (CH4)
    • 700 ppb
    • 1874 ppb
    • 168%
    • Nitrous oxide (N2O)
    • 270 ppb
    • 324 ppb
    • 20%
    • Chlorofluorocarbons (CFCs)
    • 0
    • 21-529 ppb
    • (different for each CFC)
    • NA
    • Ozone (O3)
    • 25 ppb
    • 34 ppb
    • 36%
    • ppm = parts per million
    • ppb = parts per billion
  16. Ozone Depletion

    Slide 18 - Ozone Depletion

    • Caused by called chlorofluorocarbons (CFCs)
    • CFCs
    • Escape into atmosphere
    • CFCs come from
    • Aerosols Chemicals
    • Leaky refrigerators
  17. “HOLE” in the ozone (O3)

    Slide 19 - “HOLE” in the ozone (O3)

  18. Heat waves

    Slide 20 - Heat waves

    • Heavy rain and snow
    • Droughts
    • Tropical cyclones
    • What will the Changing Climate Cause?
  19. Effects of Climate Change

    Slide 21 - Effects of Climate Change

  20. 15 to 95 cm in the next 100 years

    Slide 22 - 15 to 95 cm in the next 100 years

    • Due to glaciers melting
    • Rising Sea Level
  21. Almost All Humans Agree

    Slide 23 - Almost All Humans Agree