The Stockholm Declaration is the first document to explicitly recognise the right to a healthy environment, the declaration places great emphasis on protecting both species and their habitat.
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The 1972 United Nations Conference on the Human Environment focused on the ‘human’ environment. The conference issued the Declaration on the Human Environment, a statement containing 26 principles and 109 recommendations (now referred to as the Stockholm Declaration) from which a body of international environmental law has now developed. The creation of an environmental agency was also approved, now known as UNEP. In addition, there was the adoption of a Stockholm Action Program. There were no legally binding outcomes resulting from the Stockholm Conference. Principle 21 of the Declaration was a restatement of law already in existence since Roman times, namely that of ‘good neighbourliness’ (Wikipedia).