评估的目的是确保决策者在决定是否进行项目时将环境影响列入考虑。国际环境影响评估协会(英语:International Association for Impact Assessment)(IAIA)将环境影响评估定义为"在做出重大决定和承诺之前,先识别、预测、评估和减轻开发提案所具有生物物理、社会和其他相关影响的程序"。[55]评估的独特之处在于其并未要求项目达到预定的环境结果,而是要求决策者在过程中考虑环境价值,并根据详细的环境研究和公众对潜在环境影响的评论来证明这些决策的合理性。[56]
Climate Science Special Report – Fourth National Climate Assessment (NCA4), Volume I, Executive Summary. U.S. Global Change Research Program: 1–470. [2017-12-02]. (原始内容存档于2019-06-14). This assessment concludes, based on extensive evidence, that it is extremely likely that human activities, especially emissions of greenhouse gases, are the dominant cause of the observed warming since the mid-20th century. For the warming over the last century, there is no convincing alternative explanation supported by the extent of the observational evidence. In addition to warming, many other aspects of global climate are changing, primarily in response to human activities. Thousands of studies conducted by researchers around the world have documented changes in surface, atmospheric, and oceanic temperatures; melting glaciers; diminishing snow cover; shrinking sea ice; rising sea levels; ocean acidification; and increasing atmospheric water vapor.
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Increased Ocean Acidity. Epa.gov. United States Environmental Protection Agency. 30 August 2016 [2017-11-23]. (原始内容存档于2011-06-23). Carbon dioxide is added to the atmosphere whenever people burn fossil fuels. Oceans play an important role in keeping the Earth's carbon cycle in balance. As the amount of carbon dioxide in the atmosphere rises, the oceans absorb a lot of it. In the ocean, carbon dioxide reacts with seawater to form carbonic acid. This causes the acidity of seawater to increase.
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Holder, J., (2004), Environmental Assessment: The Regulation of Decision Making, Oxford University Press, New York; For a comparative discussion of the elements of various domestic EIA systems, see Christopher Wood Environmental Impact Assessment: A Comparative Review (2 ed, Prentice Hall, Harlow, 2002).
Steffen, Will; Sanderson, Regina Angelina; Tyson, Peter D.; Jäger, Jill; Matson, Pamela A.; Moore III, Berrien; Oldfield, Frank; Richardson, Katherine; Schellnhuber, Hans-Joachim. Global Change and the Earth System: A Planet Under Pressure. Springer Science+Business Media. 2006-01-27 [2022-10-04]. ISBN 978-3-540-26607-5(英语).