Professional Business Writing
April 30, 2011
Global Warming: Fact or Fiction
I. Are humans to blame for global warming?
a. Human causes
1. Greenhouse effect
Global warming is not something that just began. There have been several periods throughout history where surface temperatures have been higher or lower. According to Philip’s Encyclopedia (2008), “The earth is currently in the middle of a warm period that began 10,000 years ago.”
The earth’s temperature has been rising since the 19th century. Historical records indicate the sea levels have risen and glaciers are receding. The Encyclopedia of Ecology states, “There has been an increase in the atmospheric concentration of carbon dioxide.” The levels have increased over the last century from 280 ppm to 360 ppm. These atmospheric pollutants are melting parts of the Larsen Ice Shelf, Antarctica. There is ...view middle of the document...
Britannica Concise Encyclopedia states, “In 2007 the UN Intergovernmental Panel on Climate Change was 90 percent certain that most of the warming observed over the previous half century could be attributed to greenhouse gas emissions produced by human activities (i.e., industrial processes and transportation).”
II. How will this effect humanity?
2. Life expectancy
Global warming is blamed for the greenhouse effect, but we must realize that the natural greenhouse effect is a vital contributor to life on Earth. It does not have to be a major heat wave to change climatic patterns and melt snow and ice; all warming patterns give unpredictable effects on ecosystems and sea levels.
Increases in temperature will continue to cause levels of coastal waters to rise and will produce new patterns of droughts and rainfall that could seriously disrupt food production in certain regions.
Since 1860, the Earth’s average temperature has risen .5°C which is within the normal range of variability. So, all current worries are based on predictions of the response of the atmosphere to expected increases in emissions of greenhouse gases.
Humanity’s main concern is the possibility of significant warming of the Earth’s atmosphere over the next century. If this problem does continue it could affect agriculture and human stability throughout the world. The U.S. has to come up with ways to decrease the amount carbon dioxide that is polluting the air. If this does not happen soon, it could lead to dietary changes to the world’s population and a reduction in consumption of intensively-reared cattle. The suggestion that global warming threaten life on Earth is an exaggeration.
Global Warming. Retrieved from: http://wf2dnvr11.webfeat.org
Global from Bloomsburg Guide to Human Thought. Retrieved from: http://wf2dnvr14.webfeat.org
Global Warming from Britannica Concise Encyclopedia. Retrieved from: http://wf2dnvr14.webfeat.org
Global Warming from the Encyclopedia of Ecology and Environmental Management, Blackwell Science. Retrieved from: http://wf2dnvr11.webfeat.org