Understanding the Precautionary Principle
Launch library · evergreen read
The precautionary principle holds that when an activity raises genuine threats of serious or irreversible environmental harm, a lack of full scientific certainty about that harm should not be used as a reason to postpone reasonable measures to prevent it, effectively shifting the burden of proof toward demonstrating safety rather than demonstrating harm.
This differs from a purely reactive approach that waits for conclusive scientific proof of harm before acting, recognising that by the time such proof becomes fully available for some environmental problems, genuinely serious or irreversible damage may already have occurred, making prevention considerably more valuable than a cure applied too late.
Applying the principle in practice involves real judgement calls about what counts as a sufficiently serious threat and what constitutes a genuinely reasonable precautionary measure, which is part of why the precautionary principle features prominently in environmental policy debate without always being applied identically or consistently across different situations and contexts.