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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cumulative effects (environment) ： ウィキペディア英語版 Cumulative effects (environment) Cumulative environmental effects can be defined as effects on the environment which are caused by the combined results of past, current and future activities. Over time, direct and indirect human activities combine to collectively impact the environment. These effects may differ from the original, individual activities. For example, ecosystems can be damaged by the combined effects of human activities, such as air, land, and/or water pollution, improper handling of industrial waste, and other human development activities. Global warming is the cumulative effect caused by too much greenhouse gas, and it may then cause a loss in biodiversity and acid rain. North America has contributed to creating various cumulative effects on the environment. Many states in the United States have inadequate or no formal environmental review requirements in order to assess the cumulative effects on the environment from harmful practices. The extent to which cumulative effects in each state are evaluated varies greatly. For example, some programs only require an assessment on specific natural resource issues and others require comprehensive examination of cumulative effects on the environment. Environmental assessments are a necessity to ensure the further advancement of healthy ecosystems, habitats, and wildlife. == Contributors and types == The concept of cumulative effects is based on the fact that little things, when combined together, form a larger result. For example, "a single automobile, a small clear- cut in a forest, or a single septic tank is unlikely to have a measurable effect on air quality, runoff, or water quality, respectively. However, with increasing numbers of cars, clear-cuts, or septic tanks, the likelihood of a detectable change increases. This change results from multiple activities at different locations, this type of cumulative effect occurs either off-site or across a large area, such as an airshed".〔 Human disturbances in the environment create cumulative effects. The human "footprint" is a major driver of biodiversity change and cumulative effects over time, some examples are physical disturbances from activities such as energy development, cultivation, forest harvesting, and transportation infrastructure. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cumulative effects (environment)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.