Which aspect of project management helps teams understand potential environmental risks?

The correct choice is the risk breakdown structure. This tool provides a visual representation that categorizes and organizes potential risks related to a project, making it easier for teams to identify environmental risks specifically. By breaking down risks into various categories, teams can better understand and assess the likelihood and impact of environmental factors on their projects. This structured format not only aids in risk identification but also helps in developing strategies for managing those risks effectively.

Options such as the work breakdown structure primarily focus on the project's deliverables and tasks, while the project charter outlines project objectives and stakeholders. Although the risk register is an important tool for tracking identified risks, it does not categorize risks in the way the risk breakdown structure does. Hence, the risk breakdown structure is particularly valuable in understanding the various environmental risks and putting them in context within the broader project risk landscape.