I can read principle 15.
In order to protect the environment, the precautionary [principle] shall be widely applied by States according to their capabilities. Where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation.
The first sentence is obviously the commitment by states. The second sentence is the definition that was introduced by the Rio Declaration, and you will remark that it is precisely the definition that has been codified in CEPA.