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英语作文-温室效应
Global warming
Global warming means increasing average surface temperatures of earth. Global warming is attributed to increasing greenhouse gas emissions. Over the past 100 years, the global average temperature has increased by approximately 0.6 °C and is projected to continue to rise at a rapid rate. Climate models project that at current rates of population growth and greenhouse gas emissions earth surface temperatures will increase in the range of 1.6 up to 5.8°C by end of this century. Although species have responded to climatic changes throughout their evolutionary history, a primary concern for wild species and their ecosystems is this rapid rate of change. While ecologists involved in management or policy often are advised to learn to deal with uncertainty, there are a number of components of global environmental change of which we are certain-certain that they are going on, and certain that they are human-caused. Some of these are largely ecological changes, and all have important ecological consequences. Three of the well-documented global changes are: increasing concentrations of carbon dioxide in the atmosphere; alterations in the biogeochemistry of the global nitrogen cycle; and ongoing land use/land cover change.
The continued increase in the atmospheric concentration of carbon dioxide due to anthropogenic emissions is predicted to lead to significant changes in climate. About half of the current emissions are being absorbed by the ocean and by land ecosystems, but this absorption is sensitive to climate as well as to atmospheric carbon dioxide concentrations, creating a
feedback loop.About 85% of our energy comes from fossil fuels, a finite resource unevenly distributed beneath the Earth's surface. Reserves of fossil fuels are progressively decreasing, and their continued use produces harmful effects such as pollution that threatens human health and greenhouse gases associated with global warming. Prompt global action to solve the energy crisis is therefore needed. To pursue such an action, we are urged to save energy and to use energy in more efficient ways, but we are also forced to find alternative energy sources.A future of renewable energy as a primary source for the world’s energy society can no longer be ignored. Such as solar energy,it has an enormous potential as a clean, abun-dant, and economical energy source.
As fossil fuel supplies diminish and the cost of atomic energy continues to rise, while there is no safe and well-documented solution to the deposition of nuclear waste, renewable energy can step in to provide feasible alternatives to energy demands. Renewables do pose significant challenges especially in addressing the fluctuating power supply that is inherent in their nature.
Solar energy has an enormous potential as a clean, abun-dant, and economical energy source, but cannot be employedas such; it must be captured and converted into useful formsof energy.
太阳能有巨大的潜力，作为清洁、丰富和经济的能源，但不能被雇佣，它必须被捕获并转化为有用的能源形式。
全球变暖是指地球表面平均温度增加。全球变暖的主要原因之一是增加温室气体的排放。在过去的100年里，全球平均气温上升了大约0.6摄氏度，预计将继续快速上升。候模型项目,在目前的人口增长速度和温室气体排放地球表面温度将增加1.6到5.8°C的范围由本世纪
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2023-04-30
