Book excerpt: Environmental Laws and Their Enforcement is a component of Encyclopedia of Social Sciences and Humanities in the global Encyclopedia of Life Support Systems (EOLSS), which is an integrated compendium of twenty one Encyclopedias. The volume on Environmental Laws and Their Enforcement deals, in two volumes , with a myriad of issues of great relevance to our world such as: Sustainable Development and National Governance; History of Environmental Law; International Environmental Law; Constitutional Law; International Binding Mechanisms; Laws Governing Freshwater and Ground Water Pollution; Forestry; Biodiversity Conservation and Endangered Species Protection; International Guidelines and Principles; Compliance Models for Enforcement of Environmental Laws And Regulations; International Environmental Law; Life Support Systems: Law and Policy; The Principle of Sustainable Development in International Development Law; Environmental Pollution Regulations; Social Concerns for Environmental Exposures to Toxic Substances; Regulation of Air and Pollutants. These volumes are aimed at the following five major target audiences: University and College Students, Educators, Professional Practitioners, Research Personnel and Policy Analysts, Managers, and Decision Makers and NGOs.