Global warming outline - Global warming outline Sec 1 Intro...

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Global warming outline Sec 1 Intro o Intro “What is the one thing the affects every society? The environment, or its deterioration, massively affects every society.” o Global warming is coming and fast o What is global warming? o What causes it? o How can we prevent it? o Who is involved o Who is apposed to the idea? A. These basic conclusions have been endorsed by at least 30 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries. While individual scientists have voiced disagreement with some of the main conclusions of the IPCC, the overwhelming majority of scientists working on climate change are in agreement with them. o How will it affect society? o Conclusion Sec 2 What is global warming? o Increase in earths temp by a few degrees o The term is most often used to refer to the warming predicted to occur as a result of increased emissions of greenhouse gases. o The global average air temperature near the Earth's surface rose 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the last 100 years. o Climate model projections summarized by the IPCC indicate that average global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the 21st century. [1] The range of values results from the use of differing scenarios of future greenhouse gas emissions as well as models with differing climate sensitivity. Variations in Earth’s position, known as Milankovitch cycles, combine to produce cyclical changes in the global climate. These cycles are believed to be responsible for the repeated advance and retreat of glaciers and ice sheets during the Pleistocene Epoch (1.8 million to 11,500 years before present), when Earth went through fairly regular cycles of colder “glacial” periods (also known as ice ages) and warmer “interglacial” periods. Glacial periods occurred at roughly 100,000-year intervals. o Sec 3 What causes it? o "most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations" [1] via the greenhouse effect. Natural phenomena such as solar variation combined with volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward o Visible, shortwave light comes from the sun to the earth, passing unimpeded through a blanket of thermal, or greenhouse, gases composed largely of water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Infrared radiation reflects off the planet's surface toward space but does not easily pass through the thermal blanket. Some of it is
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trapped and reflected downward, keeping the planet at an average temperature suitable to life, about 60°F o Growth in industry, agriculture, and transportation since the Industrial Revolution has produced additional quantities of the natural greenhouse gases plus chlorofluorocarbons and other gases, augmenting the thermal blanket
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This note was uploaded on 04/21/2008 for the course SOCIOLOGY 101 taught by Professor Bahri during the Fall '04 term at Joliet Junior College.

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Global warming outline - Global warming outline Sec 1 Intro...

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