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Precautionary Principle The Precautionary Principle basically says that if a practice seems likely to harm the environment, even if proof is not definitive, actions should be taken to eliminate or control the practice. At the 1992 United Nations Conference on Environment and Development, Principle 15 of the Rio Declaration stated:
Even though, twenty nations signed the Vienna Convention for the Protection for the Ozone Layer 1985, the consensus emerged which held that, although a problem existed, any major consequences were well in the future. As a result, no one was required to take any action. If the Precautionary Principle had been in place, their decision might have been different.
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