The Healthy Building Network (HBN) is a national network of green building professionals, environmental and health activists, socially responsible investment advocates and others who are interested in promoting healthier building materials as a means of improving public health and preserving the global environment. Major projects include: Pharos - a project to comprehensively evaluate the health, environmental and social justice impacts of building materials through an open source, user driven tool. Unity Homes - a project to develop modular affordable housing that is healthy, green and sensitive to social justice issues. Green Guide for Health Care - providing guidance for building and operating health care facilities that are healthy and environmentally sound.