Lecture 10

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Published on 30 Oct 2010
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Glg205 t 10
Concern about environmental issues:
- Personal health
o E.g. lung cancer, eutrophication effects on fish
so what are we doing?
- Sometimes the action is fast and effective (e.g. CFCs)
- Sometimes the action is not so effective and slow (e.g. global warming)
Policy hurdles
- Ævo]]WZ]vPZ}v[ZÀu}vÇÀoµ
Ozone
- Note when 03 formed in the atmosphere (about 2.5 million years ago)
o Slightly after atmosphere was oxygenated
- Note how 03 forms in the atmosphere
o Cyanobacteria took in CO2 and produced oxygen
o Sunlight hit the oxygen and broke it up into oxygen radicals
o They combine to form ozone
- Tropshpere ozone is a pollute
o Big component of smog
- Absorption of UV
o Warm air over cold air caps troposphere
Stratospheric ozone balance
- Ozone + UV ->
- Chlorine and nitric oxide combining with ozone to form oxygen
- Chlorine and nitric oxide work as a catalyst for ozone breakdown
Ozone depleting chemicals
- Sunlight breaks apart CFC and freeze the chlorine radical that catalyzes ozone breakdown
Arctic vs Antarctic
- Thinning was not evident in Arctic until recently
- Arctic not as cold as Antarctic
- Less ice crystals in the atmosphere where chlorine rest on to do their work
Antarctic
- Polar vortex t }o]]vZv]vÁu]v[v
o CFCs trapped in the cold air during the whole period
- Evidence of polar vortex
Montreal protocol
- Patents for CFC were running out
o Not making so much money by making CFC
- Scientists were certain what was making the ozone hole
- Industries wanted new patents to make more money
G7 economic summit in Paris
- Development of state of the environment indicators
Earth summit
- Stabilize greenhouse gas emissions
Kyoto
- Montreal protocol was replaced by new patents but now its hard to replace the fossil fuels we
use
- v[µu]]}v](Z}µv[o
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Document Summary

Sometimes the action is fast and effective (e. g. cfcs) Sometimes the action is not so effective and slow (e. g. global warming) Note when 03 formed in the atmosphere (about 2. 5 million years ago: slightly after atmosphere was oxygenated. Note how 03 forms in the atmosphere: cyanobacteria took in co2 and produced oxygen, sunlight hit the oxygen and broke it up into oxygen radicals, they combine to form ozone. Tropshpere ozone is a pollute: big component of smog. Absorption of uv: warm air over cold air caps troposphere. Chlorine and nitric oxide combining with ozone to form oxygen. Chlorine and nitric oxide work as a catalyst for ozone breakdown. Sunlight breaks apart cfc and freeze the chlorine radical that catalyzes ozone breakdown. Thinning was not evident in arctic until recently. Less ice crystals in the atmosphere where chlorine rest on to do their work. l yl  : cfcs trapped in the cold air during the whole period.

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