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Global Warming.

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Introduction

Global Warming Exercise five Global warming is, "The gradual increase in the overall temperature of the earth's atmosphere due to the greenhouse effect caused by increased levels of carbon dioxide, CFC's and other pollutants" (The new oxford dictionary of English 2000). Some greenhouse gases occur naturally in the atmosphere, while others result from human activities. Once, all climate changes occurred naturally. However, during the Industrial Revolution, human activity released more gases into the atmosphere, and now through population growth, fossil fuel burning, and deforestation, we are affecting the mixture of gases in the atmosphere. This assignment will set out what global warming is, the impacts of global warming and what we can do to reduce the effects. The greenhouse effect can be explained simply in figure one below. (http://www.epa.gov/globalwarming/emissions/index.html) The Greenhouse effect is a natural process which warms the earth. Without the greenhouse effect average surface temperature would be -15 degrees Celsius rather than 15 degrees Celsius. Global warming is a term which is often used to refer to the effects of the accelerated green house effect. While the greenhouse effect is totally natural, since the industrial revolution the chemical make up of the atmosphere has changed. ...read more.

Middle

If the climate changes slowly enough, warmer temperatures may enable trees to colonize north into areas that are currently too cold, at about the same rate as southern areas become to warm and dry for the species to survive. If the earth warms 2 degree Celsius in 100 years, the species would have to migrate about 2 miles every year. Trees whose seeds are spread by birds may be able to spread at this rate but wind and nut-baring trees may have problems. Other problems may arise if there are barriers to movement such as roads, cities, or poor soils. Over the last 100 years it has been estimated that sea level has risen 10-25 cm. The problems of this are obvious. Many coastal locations would be lost to the rising sea level, coastal weathering would be increased and small islands are starting to disappear. The rise in sea level is due to glaciers melting. Half of humanity live within coastal zones around the world. "During the warm period before the onset of the last ice age, about 120,000 years ago, the global average temperature was warmer than today. Average sea level was about 5-6 metres higher than present." ...read more.

Conclusion

global socio-economic and political systems" It is impossible to predict what will happen and when if the earth continues to heat up, but this assignment has outlined many of the predicted outcomes of a change in earth surface temperature. Humans are responsible for realising more greenhouse gasses than natural resources and have destroyed many sinks. Human health is dependant on a good environment. Many of the factors that lead to deteriated environment also lead to poor health. Pollution of the atmosphere polluted or inadequate water supplies and poor soil all present dangers to human health. Global warming needs to be managed in order to prevent further effects to the atmosphere. Unfortunately it may be too late as the effects are often seen years after the cause in many environmental problems. > Gribbin, John, (1990) Hot House earth; greenhouse effect and Gaia. Bantam press. > Houghton, John, (1999) Global warming; the complete briefing, Lion press. > Kemp, David D, (1998) Global environmental issues, 3rd edition. Routlage press. > Roan, Sharon L, (1998) Ozone crisis. Wiley science editions. > Townsend, Mark, September 2002, The state were in, Geographical magazine for the royal geographical society, volume 74, issue 9, page 16. > Various, (2000) The New Oxford dictionary of English, Oxford publications. > www.ncdc.noaa.gov, United States Climate centre information, accessed 06/08/2002. ...read more.

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