第四部分，主要介绍了土地规划环境影响识别的含义、目的和识别的内容。
The fourth part mainly provides the implication, aims and contents for impact identification.
组织应识别风险源、影响的区域、事件（包括环境的变化）和其所产生的原因及潜在的后果。
The organization should identify sources of risk, areas of impacts, events (including changes in circumstances) and their causes and their potential consequences.
环境扫描的活动，它试图识别谁是竞争者，他们在做什么，竞争对手的行动将对组织产生什么影响。
Environmental scanning activity that seeks to identify who competitors are, what they are doing, and how their actions will affect the organization.
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