Essay on Global Warming

8675 Words Feb 16th, 2012 35 Pages
Table of content:

Abstract 3


II. Theory 1: GLOBAL WARMING IN THE PAST 5 • Article 1: Volcanism • Article 2: Orbital variation • Article 3: Solar output • Article 4: Plate tectonic • Article 5: Solar radiation III. Theory2: THE GREENHOUSE EFFECT 7

• Article1: Carbon Dioxide • Article2: Methane • Article Ni trous Oxide • Article Ozone • Article4: Synthetic Chemicals • Article 5: Aerosols IV. Theory3: EFFECTS OF GLOBAL WARMING 13

• Article 1: Weather • Article 2: Ice Sheets and Glaciers • Article 3: Sea Level • Article 4: Agriculture • Article 5: Plants and Animals
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A panel convened by the U.S National Research Council, in 2007 voiced a "high level of confidence" that Earth is the hottest it has been in at least 400 years, and possibly even the last 2,000 years. Studies indicate that the average global surface temperature has increased by approximately 0.8°C over the last century. This is the largest increase in surface temperature in the last 1,000 years and scientists are predicting an even greater increase over this century. This warming is largely attributing to the increase of greenhouse gases (primarily carbon dioxide and methane) in the Earth's upper atmosphere caused by human burning of fossil fuels, industrial, farming, and deforestation activities.
The global temperatures may increase by 1.4-5.8ºC (that is 2.5 - 10.4º F) by the end of the 21st century, depending on the emission of greenhouse gases. Although the numbers sound small, they can trigger significant changes in climate. Besides resulting in more hot days, many scientists believe an increase in temperatures may lead to changes in precipitation and weather patterns. Warmer ocean water may result in more intense and frequent tropical storms and hurricanes. Sea levels are also expecting to increase by 0.09m - 0.88 m. in the next century, mainly from melting glaciers and expanding seawater. Global Warming may also affect wildlife and species that cannot survive in warmer environments may become extinct. Finally, human health is also

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