There is no global human rights treaty which requires all countries in the world to recognise the right to a healthy environment. The official position of the United Nations (UN) is that a healthy environment is important, and may be linked to the full enjoyment of human rights, but at this stage there is no recognised right to a healthy environment. This is reflected in international case law, which typically associates a healthy environment with existing human rights to culture, private and family life, and so on.
A human right to a healthy environment is recognised in some regional treaties, and some countries have taken steps to include the right to a healthy environment in their domestic legislation. However, different countries have interpreted this right differently.
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