The National Environmental Management Act (NEMA) defines "environment" as the surroundings within which humans exist. These are made up of:
In addition, the Environment Conservation Act defines the environment as "the aggregate of surrounding objects, conditions and influences that influence the life and habits of man or any other organism or collection of organisms.
Legislation, from an environmental point of view, may be divided into six categories:
There are a number of diverse sources of South African environmental law:
International law – Both international customary law and international conventions function as sources of South African environmental law.
Common law – A variety of common-law rules, derived from neighbour law, for example, and the law of nuisance, are of significance as sources of environmental law. The dictum sic utere tuo ut alienum non-laedas (use your own property in such a manner as not to injure that of another) furnishes one instance.
Constitution of South Africa – The Constitution now informs and underlies the entire legal system in South Africa. Of prime importance is the Bill of Rights, with its explicit provision for environmental rights. The Constitution provides a framework for the administration of environmental laws.
Statute law – Environmental law is also derived, fairly obviously, from national and provincial legislation, and from local by-laws.
Customary law – Custom functions to some degree as a source of environmental law.