关于全球气候变暖现象的研究 [2]
论文作者:www.51lunwen.org论文属性:作业 Assignment登出时间:2014-06-17编辑:lzm点击率:4324
论文字数:1726论文编号:org201406171649569850语种:英语 English地区:中国价格:免费论文
关键词:全球气候变暖Global Warmingclimate changegreenhouse gases温室效应
摘要:The global warming effect has sounded alarm bells that it's urgent to deal with the problem that how to make the balance between economic development and environment protection. If bigotry, today's wealth at the expense of over-consumed environmental resources will be used to build the luxurious tombs for the succeeding generations.
of years. Though methane accounts for a rather small portion, it is quite efficient that can be easily transformed into its stubborn partner carbon dioxide. That is to say, all the figure points at this property stabilized gas, which acts as the insulating cover of the earth as a result of its good heat-preservation performance. Where do the soaring carbon emissions come from? People put themselves to deep reflection.
2.3. Human activities
In the last few decades, scientists have reached consensus and reported that human beings are causing changes in the Earth's climate—something previously seen as beyond our control.
It's indeed the case that demographic factors lie at the root of environmental issues. In the 20th century, the human population quadrupled and primary power consumption increased 16-fold (Advanced technologies to Global Climate Stability: Energy for a Greenhouse Planet 2002). According to the United Nations, the current world population of 7 billion is likely to exceed 10 billion over the next 90 years. The pressure of the rapid growth intensifies the burden of nature capacity. It also indicates an alarming number related to carbon dioxide emissions from human breath.
Another decisive culprit is the overuse of fossil fuel including coal, oil and natural gas. Since the Industrial Revolution 200 years ago, mankind has depended heavily on fossil fuel, whose combustion can bring people the energy for industry, transportation as well as wealth. Meanwhile, it inevitably produces by-product represented by carbon dioxide. There is date demonstrating that three-quarters of greenhouse gases on Earth comes from fossil fuel burning.
In addition, some other activities such as cement production, tropical deforestation and water pollution to varying degrees exacerbate the situation.
3. The impacts of global warming
As mentioned above, the rising of the temperature of the weather on Earth may induce beat all aftermaths. Here, this assay intends to illustrate some noticeable adverse impacts which makes people scowling, to help establish a better understanding of the problem.
3.1. Expected environmental effects
An increase in global temperature will cause sea levels to rise, hence speeding up water consumption and evaporation. The subsequent nightmare may be a more frequent occurrence of extreme-weather events ranging from heat waves, droughts to heavy rainfall, and a probable expansion of subtropical deserts. Warming is expected to be strongest in the Arctic and would be associated with the continuing retreat of glaciers, permafrost and sea ice. Other likely effects of the warming include species extinctions when the shifting temperature regimes exceed the limits of their adaptation, the spread of pests and water-borne diseases.
3.2. Expected social system effects
It is no exaggeration to say that climate change threatens the survival of vulnerability of human societies in a long run (If We Seek, Do We Learn?: Predicting Knowledge of Global Warming 2009:3). With the rising sea levels, some small islands may disappear, forcing those coastal residents to migrate to new habitats. It's presumably that people begin to fight for the decreasing land and water supplies, which can turn into massive wars. At the same time, they probably have to suffer from tropic infectious di
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