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Global Warming (1)

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by

David Nisbet

on 15 April 2010

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Transcript of Global Warming (1)

Global Warming Definition: "the increase in the average temperature of Earth's near-surface air and oceans since the mid-20th century and its projected continuation." Caused by: Greenhouse gases Water vapor
Carbon dioxide
Methane
Ozone Greenhouse effect Natural insulating effect of the atmosphere on the earth
Allows the planet to support such a wide diversity of plants and animals
Tiny amounts of different greenhouse gases (GHGs) in the atmosphere absorb some of the heat reflected from the Earth's surface before it can escape into space What causes it?

What are the impacts? Impacts Melting of polar ice sheets Leads to an increase in sea levels by perhaps 1 metre
Enormous impact on coastal populations Increase in precipitation Higher temperatures would cause more evaporation from oceans
Would not increase everywhere on earth - areas that receive lots would get more, while those with less would become even more dry Forests would suffer Forests would die as regions became too dry to support tree growth
Forested regions of Canada would become completely reorganized - ex. pine beetle Agricultural regions would be affected In Canada, some would become more productive with increased precipitation and longer, warmer growing seasons
Others would become less productive as precipitation declined and temperatures rose "Climate change refugees" Millions of people would have to abandon their homes because of the disruptions in the local climate
Conflict and social strife would increase as stresses on the economy and tensions over limited resources increase
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