Global Warming: A Look at Both Sides of the Issue

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Throughout history climates have drastically changed. There have been shifts from warm climates to the Ice Ages (Cunningham & Cunningham, 2009, p.204). Evidence suggests there have been at least a dozen abrupt climate changes throughout the history of the earth. There are a few suspected reasons for these past climate changes. One reason may be that asteroids hitting the earth and volcanic eruptions caused some of them. A further assumption is that 22-year solar magnetic cycles and 11-year sunspot cycles played a part in the changes. A further possibility is that a regular shifting in the angle of the moon orbiting earth causing changing tides and atmospheric circulation affects the global climate (Cunningham & Cunningham, 2009, p.205). Scientific studies suggest that all these played a role in past global warming and cooling periods. Today, however, there is a lot of conflict on whether humans are causing a global warming that could be disastrous to humans and all species of plants and animals on this earth. This paper will first explain the greenhouse effect, then take a look at both sides argument, and, finally, analyze the effect of global warming on world-wide sustainability First is a description of the greenhouse effect. The earth’s atmosphere has four layers, or zones, with each having distinct differences in temperature. The troposphere is the first layer surrounding the earth. Within this layer air is continually circulating and moving heat and moisture around the earth. The troposphere is denser than the other layers due to the fact that gravity keeps the majority of air molecules near the earth. This is about 75 percent of all the atmospheric mass. It is also the warmest layer (Cunningham & Cunningham, ... ... middle of paper ... ...11, from http://www.petitionproject.org/ Sheppard, M., (2010). Post climategate: Towards a reassessment of the global warming. Retrieved February 13, 2010, from http://www.globalresearch.ca/index.php?context=va&aid=20017 Shwartz, M. (2003). Effects of global warming already being felt on plants and animals worldwide. Retrieved February 18, 2011, from http://news.stanford.edu/pr/03/root18.html U.S. Environmental Protection Agency (2010). Agriculture and Food Supply. Retrieved February 16, 2011, fromhttp://www.epa.gov/climatechange/effects/agriculture.html U.S. Environmental Protection Agency (2010). Greenhouse gas emissions. Retrieved February 14, 2011, from http://epa.gov/climatechange/emissions/index.html U.S. Environmental Protection Agency (2010). Sea level changes. Retrieved February 18, 2011, from http://www.epa.gov/climatechange/science/recentslc.html
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