The aforementioned principle first appeared within the international system in the year 1972, when the United Nations Conference on the Human Environment took place in Stockholm. It refers to the first global conference to attach due importance to environmental issues, making them the center of world-wide reflection, while also placing them in dialogue between industrialised and developing countries, and in association with economic development, air, water and ocean pollution; but also the well-being of people all over the world. These issues were discussed in 7 related proclamations in all 26 principles, while the above-mentioned conference achieved the formulation of the United Nations Environment Programme (UNEP).