全球变暖英文论文

Global Warming

There is one of the most sensitive global climate issues for years, which is global warming. In general, we know that the origin of global warming is the emission of carbon dioxide. It was verified that the relationship between carbon dioxide and temperature: when there is more carbon dioxide the temperature gets warmer. This topic should be discussed under current situation to advocate people concerning with this severe environmental issue. Meanwhile, people should consider how to reduce the emission of carbon dioxide and take some actions to stop global warming. What is global warming? What caused global warming? What are the negative effects caused by global warming? What can we do to save the earth? Are there any positive effects? In the next paragraphs, I will explain these questions in details.

What is global warming? Global warming is the increase in the average temperature of Earth's near-surface air and oceans since the mid-20th century and its projected continuation (Brown 22). According to the 2007 Fourth Assessment Report by the Intergovernmental Panel on Climate Change, global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 20th century (Keppler). In nearly 100 years, the average global temperature goes through four fluctuations: cold, warm, cold again, and warm again. After 1980s, the temperature was ascending obviously.

What caused global warming? It is caused by several factors. First, population explosion is one of the main factors of global warming; it also threatens the balance between man and nature. Second, atmospheric pollution is being on the rise, and it

has already become an international major problem. It is also the basic problem of global warming. Third, marine ecology and environment took a turn for the worse. That may lead to the damage of fresh water resouces. Forth, erosion, salinization, and desertification of land make the ecological environment deteriorated, and flood and sand storm may happen more frequently. Fifth, the forest resources are sharply decreased by natural changes and human actions. Sixth, acid rain can destroy the forests, acidate lakes, and endanger animals. Seventh, water pollution destroyed

the balance between the demand and supply of fresh water. Last, toxic chemical wastes have threats on the ecological environment on the earth’ surface. (Brown 46).

What are the negative effects caused by global warming? This serious environmental problem generates amount of destructive effects to the entire planet: ice melting, climate change, animals and plants’ extinction, and threat of human society. Primarily, as the temperature increases, ice melting is regard as the most intractable issue. Melting of ice raises the sea level. Jonathan Overpeck, an earth scientist at the University of Arizona in Tucson thinks sea level rise will occur at rates of up to a meter or three feet per one hundred year (Brown 102). This statistic reveals the raising temperature is detrimental to global climate and the main reason why global warming results in sea level rising are strongly due to thermal expansion (Brown 102). When the temperature of the sea becomes warming than before, the sea level will rise. In addition, as a result of ice melting, landscape also transforms. Meanwhile, global warming also causes climate change to bring about many other awful effects such as more destructive storms, more fire disaster and more intense droughts.