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Environmental Science
Jovan Stefanovic

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
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