The Department of Environmental Science (DOES) was established in 2013 to centralize the offering of programs and courses in environmental science, management and environmental studies as well as the earth sciences. Prior to the creation of the department, the graduate programs in environmental management were being offered by the Institute of Climate Change and Environmental Management (ICCEM) while the undergraduate curriculum in environmental science was being administered by the Department of Biological Sciences. The courses in the earth sciences were being handled by the Department of Chemistry. These programs and courses were brought together under one unit as part of the effort of the university to implement the vertical articulation of graduate programs. In 2018, the department began to administer the existing distance learning programs in environmental management, in collaboration with the Distance, Open, and Transnational University (DOT-Uni). Initially, the department was manned by three core faculty members. Today, it has seven core faculty members with advanced degrees in the various subfields or allied disciplines of environmental science. In 2019, a core faculty member of the department was appointed to the rank of professor. In 2014, the department served as host to a Canadian professor who conducted training-workshops on green chemistry education that it co-organized. A US Peace Corps Response Volunteer was also assigned to the department in 2019, to work with the department on its extension project on community-based environmental management. The department produced its first BS in Environmental Science graduates in 2016 and its first PhD in Environmental Management graduate in 2015. It welcomed its first international student in 2018, the same year when one of its BS Environmental Science students was chosen as a BPI-DOST Science Awardee