Environmental decision-making is a process of weighting alternatives and selecting the most appropriate alternative, by integrating results of risk assessment with social, economic, political and engineering data to reach a rigorous decision. Decision-making tools help in the selection of prudent, technically feasible, and scientifically justifiable actions to protect the environment and human health in a cost-effective way (Sadiq, 2001). The main
challenge in environmental decision-making is that alternatives are multiple and diverse in nature, and often have conflicting criteria. Multiple criteria decision-making (MCDM) methods are employed where alternatives are predefined and the decision-maker(s) ranks available alternatives based on the evaluation of multiple criteria. MCDM often called multi-criteria decision aid (MCDA) and multi-criteria analysis (MCA), is a set of methods which
allow the aggregation and consideration of numerous (often conflicting) criteria in order to choose, rank, sort or describe a set of alternatives to aid a decision process. The ability of MCDM to address the numerous quantitative and qualitative criteria that affect environmental decision-making process makes it appropriate for the said topic