USGBC Sustainability Rating System for Buildings Is Based on the Building's

USGBC sustainability rating system for buildings is based on the building's impact on the natural environment, which is divided into six categories, called environmental impact categories. For example, one of the environmental impact categories is "water efficiency" (WE), which assesses the impact of the use of water in the building on the environment. Of the six categories, one of them has been dealt with in greater detail (in Chapter 10: "Principles of Sustainable Construction")than the other categories. Name the category.