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.

• 凡有可能造成严重的或不可挽回的损害的地方，不能把缺乏充分的科学肯定性作为推迟采取防止环境退化的费用低廉的措施的理由。