The Earth Summit Strategy to Save Our Planet” put forward a proposition that the world is on a path of energy production and consumption that cannot be sustained. The report drew attention to individuals and groups around the world who have a set of principles to develop strategies for change among many aspects of society, including design. More broadly, the conference emphasized that designers must address human issues. These problems included six items: quality of life, efficient use of natural resources, protecting the global commons, managing human settlements, the use of chemicals and the management of human industrial waste, and fostering sustainable economic growth on a global scale. Though Western society has only recently espoused ecological design principles, indigenous peoples have long coexisted with the environment. Scholars have discussed the importance of acknowledging and learning from Indigenous peoples and cultures to move towards a more sustainable society. Indigenous knowledge is valuable in ecological design as well as other ecological realms such as restoration ecology. Sustainable development issues These concepts of design tie into the concept of sustainable development. The three pillars addressed in sustainable development are: ecological integrity, social equity, and economic security. Gould and Lewis argue in their book Green Gentrification that urban redevelopment and projects have neglected the social equity pillar, resulting in development that focuses on profit and deepens social inequality. One result of this is green or environmental gentrification. This process is often the result of good intentions to clean up an area and provide green amenities, but without setting protections in place for existing residents to ensure they are not forced out by increased property values and influxes of new wealthier residents. Unhoused persons are one particularly vulnerable affected population of environmental gentrification. Government environmental planning agendas related to green spaces may lead to the displacement and exclusion of unhoused individuals, under a guise of pro-environmental ethics. One example of this type of design is hostile architecture in urban parks. Park benches designed with metal arched bars to prevent a person from laying on the bench restricts who benefits from green space and ecological design. Life Cycle Analysis Life Cycle Analysis (LCA) is a tool used to understand the how a product impacts the environment at each stage of its life cycle, from raw input to the end of the products' life cycle. Life Cycle Cost (LCC) is an economic metric that "identifies the minimum