The Department of Education (DepEd) Order No. 72, series of 2003, establishes YES-O as the only co-curricular environmental club or organization in schools. It consolidates all other environmental and/or ecology clubs or organizations in schools with main and primary programs or projects for the environment. This effort believes that starting them young in the ways of environmentalism help secure a clean and healthy environment for generations to come. YES-O inspires and trains diverse youth to impact environmental issues through community action projects and campaigns; skills training in leadership, environmental education, civic engagement, and community organizing; and knowledge that sustain our communities and future. 

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The YES-O has the following objectives:

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•      Be aware and create awareness in others of the state of the Philippine environment and ecology, including prevailing issues and concerns relative thereto;

•     Establish specific and doable programs, projects and activities to address issues and concerns on the environment and ecology;

•     Network with other government and non-government organizations, including Youth for Environment in Schools (YES) Organization in other schools within the division and region, with regard to support and assistance to programs, projects and activities of the organization;

•      Encourage community participation and initiative in environmental and ecological movements and actions; and

•       Develop among members and the community proper environmental values, skills and attitudes