Module 4

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  • Created on: 20-04-13 14:18
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The green house effect
o Not all bad if the green house gases weren't there out planet would be covered in
ice
o The green house effect is the process in which the absorption and subsequent
emission of infrared radiation by atmospheric gases warms the lower atmosphere
and the plants surface
o These gases are naturally occurring and these are examples of the most abundant
Water vapour
Carbon dioxide
Methane
o They absorb the radiation by the molecules vibrating and when they vibrate
vigorously the energy is released
o Global warming potential is the potential each molecule has to absorb energy
efficiently
Global warming
o This is a reality and can be observed as the polar caps are melting and the weather is
becoming more devastating
o People are trying different methods to reduce the emission of green house gases
The Kyoto protocol commits countries to reduces the carbon emissions by
5% by 2012
The other is to use alternate production methods such as wind, solar and
tidal
o The EU has agreed a long term policy on energy by reducing the fuel used in cars and
the gas emission and increase the renewable sources of energy
o Another method to reduce global warming is to use cleaner cars which reduce the
carbon dioxide emissions
Solutions to greenhouse effect
o Alternate fuels
Wind
Tidal
Solar
Nuclear
o Carbon capture is where they catch the carbon and store it away stopping it from
being released into the atmosphere
o Some companies off the coast of Scotland have been taking the oil out and replacing
it with CO2
o Some CO2 is stored in porous rocks and we have enough room to store 500 years of
carbon dioxide in the UK alone
Ozone
o The ozone is O3 and is either good or bad.
Good is in the stratosphere which is absorbs the UV light and protects us
Bad is in the troposphere which is an air pollutant and causes problems for
breathing and things like smog
o The ozone absorbs UV light with a wavelength below 320nm but the UV range is
270-400 nm but the shorter wavelength cause us the problems

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UV is split into 3 categories UV-a, UV-b and UV-c.…read more

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