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Lecture 11

EESA10 Lecture 11

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University of Toronto Scarborough
Environmental Science
Jovan Stefanovic

EESA10 LECTURE: Global Climate Change and Human Health -climate is warming up and there are reasons of why and how it happen -no debate between scientists and public, used to be a question, now we are more convinced that climate is changing and this isn’t an unusual thing, it is normal -there are period of glaciations when everything was covered with ice and between the glaciations period there is a period called interglacial period -we live in interglacial period -end of the last ice age around 10 000 years ago -therefore question is not that it’s happening, it is that is it happening faster than before? And what role do humans play in this? -greenhouse effect keeps planet alive and warm -energy from the sun warms the Earth’s surface and some energy radiates back towards space -water vapour (clouds), carbon dioxide, and other gases are heated -most important green house gases are water vapour, carbon dioxide, methane, and dinitrogen oxide -all data shows that from the beginning of century, concentration of all greenhouse gases have increased -on second graph, that concentration of greenhouse gases is directly proportional to the temperature -there are other sources than natural carbon dioxide -any kind of manure contributes to green house gases -in production of rice there are two phases, one wet and one dry, during transition of these phases a lot of greenhouse gases are released -some inorganic fertilizers are sources of nitrogen -many examples of climate change shown in present problems -some believe that global warming is good, especially for the northern countries but this is not
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