A green museum is a museum that incorporates concepts of sustainability into its operations, programming, and facility. Many green museums use their collections to produce exhibitions, events, classes, and other programming to educate the public about the natural environment. Many, but not all, green museums reside in a building featuring sustainable architecture and technology. Green museums interpret their own sustainable practices and green design to present a model of behavior. Green museums strive to help people become more conscious of the limitations of their world, and how their actions affect their world. The goal is to create positive change by encouraging people to make sustainable choices in their daily lives. They use their position as community-centered institutions to create a culture of sustainability.

Green museums aim to promote a culture of sustainability, which can be defined in two parts: culture, which includes the values, practices, beliefs and aspirations of a society. Whilst sustainability asks people to adapt at a cultural level, changing their beliefs and behavior.
Museums are in a unique position to establish and promote a culture of sustainability as they are arenas that simulataneousy preserve and create culture. As a result, museums are now considered to have a key role in shaping a sustainable future. These changes can be achieved through their exhibitions as well as their active engagement in debates surrounding climatic and environmental changes.
Museums have the capacity to influence visitor attitudes toward their local environment that can have a positive impact, for example, on the preservation of local biodiversity. Bristol Museum & Art Gallery joined a global coalition to raise awareness about the protection of biodiversity and launched its exhibit Extinction Voices which aimed to highlight the threat of wildlife extinction and gather ideas for collective action. Another aspect of museums role in the culture of sustainability is getting their visitors to engage in climate change and sustainability issues more widely.
Museums are taking a more active approach to the project development of their exhibits. Children's museums initiated the green museum movement, mainly out of health concerns for the young visitors. Using toxic materials and chemicals on structures intended for children became a high worry for both the museum staff and parents. "In its 2004 expansion project the Children's Museum of Pittsburgh used only adhesives, sealants, paints, carpets, and composite wood that are certified formaldehyde free with near-zero off-gassing."
Before the reduce, reuse, recycle mantra became mainstream, a small number of museums had already begun promoting sustainable decision making through exhibits. The Boston Children's Museum, developed a concept known as "The Recycle Shop".
Organizations are working to develop a standard rating system for the specific needs of green exhibitions. In 2008, the Oregon Museum of Science and Industry (OMSI) developed the OMSI Green Exhibit Certification guide to assist museums in assessing the environmental sustainability of their exhibits, and to help develop more sustainable forward plans. Based on the U.S. Green Building Council (USGBC) Leadership in Energy and Environmental Design (LEED) rating system, the OMSI Green Exhibition Certification guide simplified and adapted the LEED system to cater to the specific needs of the museum sector, especially in view of the limited financial and human resources found in many museums.
The guide provides a checklist for organizations who follows eight elements regularly used in exhibit design.
After evaluation, they are awarded 0-4 points:
1. Rapidly Renewable Materials
2. Resource Reuse
3. Recycled Content
4. End-life Assessment
5. Low-Emitting Materials
6. Certified wood
7. Conservation
8. Regional Materials
Through the project, Sustainability: Promoting Sustainable Decision Making in Informal Education, funded by the National Science Foundation (NSF), OMSI also developed Exhibit Social Environmental and Economic Development (Exhibit SEED) in collaboration with multidisciplinary professionals across the United States. Exhibit SEED is a toolkit designed to help museums create holistically sustainable museum exhibits. The guide is based on "Three Pillars of Sustainability for Museums," considerations based on environmental sustainability, economic sustainability, and social sustainability, and provides multiple examples of how a museum might reasonably adjust their practices to incorporate these pillars. Many museums across the globe has since developed and shared their own guidelines for sustainability in museums. The Madison Children's Museum in Madison, WI developed their own "green guide" for sustainable museum practice; their green initiatives in sustainable materials, community outreach, and museum programming led them to become the first Wisconsin museum to receive LEED certification.
