Climate change lecture outline 3/2/10 Natural history is now completely tied up with human history. The past 100 years are the first in the history of the world in which living beings (humans) have fundamentally altered the physical earth, instead of the other way around. For example, selection of species for survival and reproduction now depends on compatibility with human action (urbanization, deforestation, climate change.) Global warming is the observed increase in the average temperature of the Earth's near surface air and oceans in recent decades and its projected continuation. Global temperatures are predicted to increase by 2.0 to 11.5 °F between 1990 and 2100. Causes: the greenhouse effect 1) Historical factors in climate change include solar activity and volcanic eruptions. 2) Greenhouse gas emissions from industry, transportation and agriculture are the main cause of recently observed global warming. Greenhouse gases include carbon dioxide, methane, nitrous oxide, and ozone. 3)
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