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Example research essay topic: Carbon Dioxide Greenhouse Effect - 1,080 words

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While some people believe the earth's climatic changes are due to the fact that the universe is getting older, others believe it is due to the greenhouse effect. The greenhouse effect is a naturally occuring phenomenon that is responsible for trapping heat near the earth's surface and keeping the planet warm. It is called the greenhouse effect because the way it works is similar to the way in which a green house functions. In a greenhouse sunlight passes through the transparent roof and walls and strikes the objects inside- plants, flowerpots, tables, and so forth. These objects absorb energy from sun, become warmer, and then give off energy themselves in the form of heat. Only a little of this heat energy passes out through the glass, much of it is "trapped" in the greenhouse, raising the temperature inside.

In some ways, the earth functions rather like a greenhouse except on a much larger scale. Although the greenhouse effect has only recently been in the news, is nothing new in th history of our planet, has played major role in making life on earth possible. Without the greenhouse effect, the earth would be too cold for living thing to survive. The big question today is "If greenhouse effect is natural, why are people so worried about it. Is something good turning bad?" Up until about 150 years ago the composition of the earths atmosphere had remained relatively unchanged for several thousand years. Since mid 1800 s certain human activities have been changing the heat train ability of the atmosphere dramatically, as a result more heat is being trapped by the atmosphere.

Scientists have been anticipating this "strengthening" of the greenhouse effect for sometime, and that it will lead to a worldwide increase in temperature. This is come true because the world is getting warmer. Global warming can be expected to change the earth's climate dramatically and in a relatively short time. As temperatures increase, experts predict that weather patterns will be disrupted worldwide, the glaciers and polar ice caps will, melt, and that sea levels will rise. Global warming could change the atmosphere so much and so fast that all sorts of plants and animals might soon be in danger os extinction.

The greenhouse effect may be the most serious environmental problem the human race has ever experienced, for this reason scientists around the world are working hard to acheive a better understanding of the greenhouse effect, to predict the impact it will have on earth, and to discover ways to control it. The greenhouse effect occurs when gases such as methane, carbon dioxide, nitrogen oxide and CFCS trap heat in the atmosphere by acting as a pane of glass in a car. The glass' lets the sunlight in to make heat, but when the heat tries to escape, the gases reabsorb it. Holding this heat in causes heat waves, droughts and climatic changes which could alter our way of living. The greenhouse effect, in environmental science, is a popular term for the effect that certain variable constituents of the Earth's lower atmosphere have on surface temperatures. "It has been known since 1896 that the Earth has been warmed by a blanket of gases. The gases; water vapour (H 2 O), carbon dioxide (CO 2), and methane (CH 4) keep ground temperatures at a global average of about 15 degrees C. " (Oppenheimer, p. 119 - 120) Without them, the average would be below the freezing point of water.

The gases have this effect because as incoming solar radiation strikes the surface, the surface gives off infrared radiation, or heat, that the gases trap and keep near ground level. Environmental scientists are concerned that changes in the variable contents of the atmosphere, particularly changes caused by human activities, could cause the Earth's surface to warm up to a dangerous degree. "Since 1850 there has been a mean rise in global temperature of approximately 1 degree C. " (Gribbin, p. 14) Even a limited rise in average surface temperature might lead to at least partial melting of the polar icecaps and hence a major rise in sea level, along with other severe environmental disturbances. What is meant by the term, the greenhouse effect, is that the heat from the sun comes into the Earth's atmosphere and cannot get out so it becomes trapped. This effect occurs when the incoming short wave radiation hits the Earth's surface it changes into longwave, or infrared radiation. Heat energy in this form is then absorbed and stored in water vapour and carbon dioxide in the atmosphere. The main gases that cause the greenhouse effect are water vapour, carbon dioxide (CO 2), and methane which comes mainly from animal manure.

Other gases like nitrogen oxide and man made gases called chlorofluorocarbons get caught in the atmosphere as well. The decay of animals and respiration are two main but natural sources of carbon dioxide. Water vapour is an important "greenhouse gas." It is a major reason why humid regions experience less cooling at night than do dry regions. However, variations in the atmosphere's carbon dioxide content are what have played a major role in past climatic changes. In recent decades there has been a global increase in atmospheric carbon dioxide, largely as a result of the burning of fossil fuels. If the many other determinants of the Earth's present global climate remain more or less constant, the carbon dioxide increase should raise the average temperature at the Earth's surface.

As the atmosphere warmed, the amount of water vapour would probably also increase, because warm air can contain more water than cooler air. This process might go on indefinitely. On the other hand, reverse processes could develop, such as increased cloud cover and increased absorption of carbon dioxide by phytoplankton in the ocean. These would be natural feedbacks, lowering temperatures. Many different things cause The greenhouse effect. "The amount of carbon dioxide in the atmosphere is increased by 0. 4 percent each year because of the massive consumption of fossil fuels such as oil, coal, and natural gas. " (McCuen, p. 77) Another contributing factor is the amount of forest logged. Every second of the day the area of a football field is cleared of trees by either being logged or burnt.

Two other deadly greenhouse gases which are entering the atmosphere even faster than carbon dioxide are methane and chlorofluorocarbons, although they are not as damaging in the long run. These increases are likely to affect worldwide temperature...

Free research essays on topics related to: carbon dioxide, nitrogen oxide, fossil fuels, greenhouse effect, infrared radiation

Research essay sample on Carbon Dioxide Greenhouse Effect

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