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Global Warming Essay

Extracts from this document...

Introduction

1.1 What is Global warming? What is global warming? Global warming is an increase in the Earth's average atmospheric temperature that causes corresponding changes in climate. This results from an increase greenhouse effect. A panel convened by the U.S National Research Council, (the USA's premier science policy body), in June 2006 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 0.5-1.0�F (0.3-0.6�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 attributed 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 including. www.solar-center.stanford.edu/sun-on-earth/glob-warm.html 1.2 Green house effect There are two meanings of the term "greenhouse effect". There is a "natural" greenhouse effect that keeps the Earth's climate warm and habitable. There is also the "man-made" greenhouse effect, which is the enhancement of Earth's natural greenhouse effect by the addition of greenhouse gases from the burning of fossil fuels (mainly petroleum, coal, and natural gas). ...read more.

Middle

However, scientific studies have shown that a variety of human activities release greenhouse gases. These include the burning of fossil fuels for producing electrical energy, heating and transport. By increasing their concentrations and by adding new greenhouse gases like CFCs, humankind is capable of raising the average global temperature. Land Use Change: As humans replace forests with agricultural lands, or natural vegetation with asphalt or concrete, they substantially alter the way the Earth's surface reflects sunlight and releases heat. All these changes also affect regional evaporation, runoff and rainfall patterns. Land use and the changes in the way it is used effect the global carbon cycle, reduce the world's forests and woodlands, expand the cropped land area, and cause tropical deforestation. As well, there is increased productivity of labor in exploiting land through the application of capital and new technologies. Conversion of land from natural to agricultural use also upsets the balance. Atmospheric aerosols: Humans are adding large quantities of fine particles (aerosols) to the atmosphere, both from agriculture and industrial activities. Although most of these aerosols are soon removed by gravity and rainfall, they still affect the radiation balance in the atmosphere. Whether this effect adds to or offsets any warming trend depends on the quantity and nature of the particles as well as the nature of the land or ocean surface below. ...read more.

Conclusion

This is taken from www.sciencedaily.com/releases/2003/02/030214074147.htm Hockey stick graph The graph above is called a hockey stick graph because it has a sudden rise at the end of the graph. This graph shows a sharp rise since the industrial revolution, caused by increased CO2 in the earth's levels from increased burning of fossil fuels by industry. I took this image from the following website : www.21st-century-citizen.com Conclusion I strongly believe global warming was caused by man because we use chemical and produce chemicals which harm the earth we know is dangerous but we still ignored it. Example burning fossil fuels producing carbon dioxide which we know is bad we still burn them. Deforestation is another reason why global warming is man made because of the rate trees are being cut down. Trees take in carbon dioxide and gives out oxygen (photosynthesis) this process helps keep plants and humans alive. Global warming has serious consequence's for example the health of humans, rising sea levels, extinction of animals and much more. We can help stop global warming for example recycling which reduces the amount of factories manufacturing the product and reducing distribution which means fewer Lorries. Another way humans try to reduce carbon is by using bio fuel for cars (instead of petrol) which is from plants to help reduce the amount of carbon dioxide. ...read more.

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