Graywater includes wastewater from lavatory faucets, whereas blackwater includes wastewater from toilets and urinals. This describes the difference between graywater and blackwater according to LEED. Graywater is wastewater that has been used for non-potable purposes, such as washing hands or dishes, but does not contain human or animal waste. Blackwater is wastewater that has been contaminated with human or animal waste from toilets or urinals. Graywater can be reused for certain purposes after minimal treatment, such as irrigation or toilet flushing, whereas blackwater requires more advanced treatment before reuse or disposal. The LEED Green Associate Candidate Handbook states that one of the strategies for achieving water efficiency is to ''use non-potable water (graywater) for sewage conveyance'' [1, p. 14].Reference:LEED Green Associate Candidate Handbook, [Graywater vs Blackwater | U.S. Environmental Protection Agency]

The cradle-to-cradle approach to sustainable materials evaluates building materials from extraction to reuse, which means that the materials are considered as part of a continuous cycle of use and regeneration, rather than a linear process of consumption and disposal. The cradle-to-cradle approach aims to eliminate waste and pollution, conserve resources and energy, and create positive impacts for the environment and human health.The cradle-to-cradle approach is based on the principles of eco-effectiveness, which include designing products and systems that are safe and healthy for humans and nature, using renewable energy and clean water, celebrating diversity and creativity, and respecting social and environmental justice12.The cradle-to-cradle approach is also recognized and encouraged by LEED v4, which includes a credit for using products that have achieved Cradle to Cradle certification34.

A charrette is an intensive planning session where citizens, designers, and others collaborate on a vision for development. It provides a forum for ideas and offers the unique advantage of giving immediate feedback to the designers. More importantly, it allows everyone who participates to be a mutual author of the plan. This should be conducted first to ensure all stakeholders are aligned on the project goals and strategies before proceeding with detailed analyses or modeling.Reference: LEED Green Associate Candidate Handbook, U.S. Green Building Council resources

Green Seal is a non-profit organization that develops standards and certifies products and services that are environmentally preferable and meet rigorous performance criteria1.Green Seal has standards for various categories of products and services, including custodial products and materials, such as cleaners, degreasers, floor care products, paper products, and hand soaps2.Green Seal-certified custodial products and materials can help achieve credits in the LEED v4 Materials and Resources category, such as Purchasing - Ongoing Consumables34.

About Us | Green Seal1

Standards | Green Seal2

LEED v4: Building Design + Construction Guide - U.S.Green Building Council3

Credit's Supporting LEED's Materials and Resources Category | Legrand4

An infill site within an existing neighborhood with substantial transit connectivity would maximize LEED points under Location and Transportation. An infill site is a site that has been previously developed or graded and is surrounded by existing development. An existing neighborhood is a geographic area with a variety of land uses, such as residential, commercial, educational, or recreational. Substantial transit connectivity means that the site has access to multiple modes of public transportation, such as buses, trains, light rail, or bicycles. The LEED Green Associate Candidate Handbook states that one of the intents of the Location and Transportation category is to ''encourage development within existing communities and public transit infrastructure'' [1, p. 12].Reference: [LEED Green Associate Candidate Handbook], [Location and Transportation | U.S. Green Building Council]