Green house effect
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Green house effect

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Green house effect Green house effect Presentation Transcript

  • CAUSES & THREATS OF
    GREEN HOUSE EFFECT
  • What does a greenhouse look like?
    • Most greenhouses look like a clear mini glass house. They are used to grow plants in any environment. Greenhouses work because when the sun comes out the green house can trap the sunlight and use it to grow plants. The glass panels trap as much sunlight as possible but keeps heat in. This causes the greenhouse to heat up and help the plants grow.
  • How is the earth like a greenhouse?
    Like a greenhouse the earths atmosphere traps heat and energy from the sun.
  • The Greenhouse Effect on Earth
    Earth’s atmosphere is slightly warmer than what it should be due to direct solar heating because of a mild case ofgreenhouse effect…
    • The ground is heated by visible and (some) infrared light from the Sun.
    • The heated surface emits infrared light.
    • The majority of Earth’s atmosphere (N2 and O2) are not good greenhouse gas.
    • The small amount of greenhouse gases (H2O, CO2) traps (absorb and re-emit) the infrared radiation, increasing the temperature of the atmosphere…
  • incoming
    radiation
    Solar energy reaches the Earth’s surface
  • incoming
    radiation
    infrared radiation
    Earth’s surface warms, emits radiation
  • incoming
    radiation
    greenhouse
    gases
    infrared radiation
    Greenhouse gases absorb IR leaving the surface
  • incoming
    radiation
    greenhouse
    gases
    infrared radiation
    Gases are energized, then emit radiation (IR)
  • incoming
    radiation
    greenhouse
    gases
    infrared radiation
    Some of this IR reaches the planet surface, warming it further
  • THE GREEN HOUSE EFFECT
    • Carbon Dioxide (CO2)
    • Methane (CH4)
    • Water Vapor (H2O)
  • THE CARBON CYCLE
  • b
  • So, what’s the big deal if human CO2 causes 1°C temperature increase?
    • An increase in atmospheric temperature (human or natural origin) will lead to the increase in the water vapor content of the troposphere.
    • Because water vapor is a strong greenhouse gas, the increase in H2O vapor in turn causes enhanced greenhouse effect, raising the temperature more.
    • Higher atmospheric temperature will cause more evaporation of water
    • Which leads to even higher temperature…
    Runaway Green House Effect!
  • Climate models suggest that the changes are just beginning now and will accelerate.
  • Arctic Ice Melting Faster Than Predicted
  • CLIMATECHANGE
  • Greenhouse Gases
    • The primary components of Earth’s atmosphere, N2 and O2 do not have absorption in the IR wavelength range, therefore, do not have a significant role in setting the surface temperature of the planet…
    • Greenhouse gas are efficient in absorbing IR light…
    The most important greenhouse gases are:
    • H2O – Water vapor.
    • CO2 – Carbon Dioxide
    • CH4 – methane
    • The most abundant greenhouse gas in Earth’s atmosphere is water vapor. Most of the greenhouse heating of Earth’s atmosphere is due to Water vapor absorption of IR radiation emitted by Earth, and then transferring the energy to the surrounding air molecule
  • Greenhouse Gases
    The following pie chart displays the percent of each gas
    which plays a role in the greenhouseeffect.
  • How we contribute
    • Burning natural gasses
    • Deforestation
    • Population growth
  • WHAT CAN WE DO?
    • We must move to a carbon-free economy.
    • That means reduce or eliminate use of fossil fuels to limit damage in the future.
    • Alternative energy sources such as wind, solar, geothermal, and tidal are needed.
    • Increase forest cover.
    • Sequester (remove) carbon from the atmosphere.
    • If all excess carbon dioxide release stopped today, it is estimated that it would take hundreds of years for levels to return to normal (NASA, 2007).
  • Without It
    Without the greenhouse effect, the Earth would not be able to support life. But if the greenhouse effect becomes too strong, the earth will be too hot to support life. Even a little to much heat could hurt the animals, plants, and everything else on the planet. Without the gasses that surround the planet, heat would escape back into space, causing the earths average tempter to be about 60 degrees colder.
  • Runaway Greenhouse Effect
    If we were to move the Earth closer to the Sun, like where Venus is now, then we would suffer the runaway greenhouse effect as well, lose all the water, and become hot like Venus.
  • Other planets also have Greenhouse Effects,
    but these are unsuitable for life
    Venus
    Atmosphere: mass 90x earth’s
    GH Gases: >90% CO2
    Sfc. Temp.: 477C
    GH Effect: 523C
    FAR TOO HOT!
    Earth
    GH Gases: ~0.04% CO2
    ~ 1% H2O
    Sfc. Temp.: 15C
    GH Effect: 33C
    NOT BAD!
    Atmosphere: mass <1% earth’s
    GH Gases: >80% CO2
    Sfc. Temp.: -47C
    GH Effect: 10C
    FAR TOO COLD!
    Mars
    Sun
  • SUMMARY
    Greenhouse gases absorb infrared radiation and prevent it from escaping to space.
    Carbon dioxide, methane, and nitrous oxide are very good
    At capturing energy at wavelengths that other compounds
  • THANK YOU!!!
    BY:
    PRANAY RAJPUT%X B