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Lecture

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Department
Environmental Science
Course Code
EESA10H3
Professor
Jovan Stefanovic

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Lecture #11: Global Climate Change, Ozone Depletion and Human Health
Wednesday, April 6th/2011
The question nowadays is not anymore that Is climate change really happening?
Instead questions are that:
oHow fast is it going to happen?
oWhen are we going to see its health effects?
oHow much are humans affecting/speeding up the rate of climate change,
through human emission?
oWhat is the role of human emission?
Climate is changing, normally; has been changing over the millenniums, nothing
unusual
Over time, phases of climate: Glaciations, warm periods normally alternating
through history
This process is much faster right now
Things that used to take millenniums and hundreds of years to occur, are now
happening much faster
Greenhouse effect: keeps planet warm, very unpleasant place if there is no such
effect
Water vapour as one very important greenhouse gas -- #1 greenhouse gas, since its
not produced by the industry and is not a human emission, we dont really talk about
it; however, its role is very imp in keeping the planet warm
Home is the largest emitter of co2, Canada is at the 8th place, but is 4X the global
average, therefore its a lot
Evidence for climate change
Importance of co2 in atmosphere and how that concentration of CO2 is directly
proportional to global temperature
Processes affecting increase of greenhouse gases combustion, fossil fuels, burning =
#1, transportation, industries also some biological processes using inorganic
www.notesolution.com
fertilizers is emitting nitric acids, also growing rice is emitting nitrogen gases,
livestock burning their organic matter releases methane also a greenhouse gas
Health effects or potential health effects of climate change graph summarizes
almost all health effects we CAN expect, but its not known, n one really knows will
happen, models can only predict **IMP*** REVIEW THIS SLIDE for FINAL
EXAM!
Ozone Depletion
Lots of ozone significantly may affect the health bad UV rays, such as A, mostly C,
B are filtered through ozone layer; good ozone in stratosphere is filtering bad UVS,
not ground-level ozone; since ozone layer is thinning not holes due to the release
of CFCs chlorofluorocarbons has been incorporated into some products like hair
sprays, cooling products in fridge cause the breakdown of ozone and producing
elemental oxygen and O2
Now bad UVs such as UVBs and Cs have been able to reach the ground and effect
humans..not just humans also all other living organisms and also other materials as
well e.g. construction materials, textiles, wood, causing deteriorating of these
materials as well
Human health dramatic increase in dermal cancer blaming bad UV rays extremely
high increased rate of these types of cancer
Cataracts also are increasing esp. in countries like India or countries with lots of
sunlight, not always related directly just to ozone depletion also related to amount of
sunlight exposure; huge numbers of people getting cataracts in South Asian
countries and many get them operated
Outer immune system basically decreasing the immunity to some other illnesses
simple illnesses like cold, flu; not rare that if you are sunbathing for a couple of
days, your immune system gets weaker
Wildlife and other animals and plants are also being effected by UV spectra
Last decade there have also been increase warnings about effects of UVA part of
wavelength
We thought they werent causing problems but now some types of skin cancers have
been related to UVA; many research is going on now to look at its effects , we know
UVB and C are really damaging lots of research being done on UVA
Species
www.notesolution.com

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Description
Lecture #11: Global Climate Change, Ozone Depletion and Human Health Wednesday, April 6 2011 The question nowadays is not anymore that Is climate change really happening? Instead questions are that: o How fast is it going to happen? o When are we going to see its health effects? o How much are humans affectingspeeding up the rate of climate change, through human emission? o What is the role of human emission? Climate is changing, normally; has been changing over the millenniums, nothing unusual Over time, phases of climate: Glaciations, warm periods normally alternating through history This process is much faster right now Things that used to take millenniums and hundreds of years to occur, are now happening much faster Greenhouse effect: keeps planet warm, very unpleasant place if there is no such effect Water vapour as one very important greenhouse gas -- #1 greenhouse gas, since its not produced by the industry and is not a human emission, we dont really talk about it; however, its role is very imp in keeping the planet warm Home is the largest emitter of co2, Canada is at the 8 place, but is 4X the global average, therefore its a lot Evidence for climate change Importance of co2 in atmosphere and how that concentration of CO2 is directly proportional to global temperature Processes affecting increase of greenhouse gases combustion, fossil fuels, burning = #1, transportation, industries also some biological processes using inorganic www.notesolution.com
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