Cartagena Protocol on Biosafety

https://en.wikipedia.org/wiki/Cartagena_Protocol_on_Biosafety

The Biosafety Protocol seeks to protect biological diversity from the potential risks posed by genetically modified organisms resulting from modern biotechnology...

It will for example let countries ban imports of a genetically modified organisms if they feel there is not enough scientific evidence that the product is safe and requires exporters to label shipments containing genetically altered commodities such as corn or cotton.

The required number of 50 instruments of ratification/accession/approval/acceptance by countries was reached in May 2003. In accordance with the provisions of its Article 37, the Protocol entered into force on 11 September 2003. As of March 2015, the Protocol has 170 parties, which includes 167 United Nations member states, Niue, the State of Palestine, and the European Union.

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Precautionary Principle

https://en.wikipedia.org/wiki/Precautionary_principle

The precautionary principle or precautionary approach to risk management states that if an action or policy has a suspected risk of causing harm to the public or to the environment, in the absence of scientific consensus that the action or policy is not harmful, the burden of proof that it is not harmful falls on those taking an action...

Regarding international conduct, the first endorsement of the principle was in 1982 when the World Charter for Nature was adopted by the United Nations General Assembly, while its first international implementation was in 1987 through the Montreal Protocol.