The principle of environmental integration has long been regarded as an essential mechanism of international law for the effective implementation of sustainable development (Rieu-Clarke, 2005: 84-91). For example, the New Delhi Declaration of Principles of International Law Relating to Sustainable Development, adopted by the International Law Association in 2002, notes that:

the principle of integration reflects the interdependence of social, economic, financial, environmental and human rights aspects of principles and rules of international law relating to sustainable development as well as the interdependence of the needs of current and future generations of human kind.