Final answer:
The precautionary principle places the burden of proving that some activity creates a public risk on those who challenge the activity before it can be stopped.
Step-by-step explanation:
The statement is True. The precautionary principle places the burden of proving that some activity creates a public risk on those who challenge the activity before it can be stopped. This principle is applied when the effects of a human activity are not fully understood scientifically. In such cases, it is best to proceed cautiously and assume that some level of harm may exist, even if it has not been proven yet. This ensures that the potential risks to the environment and human health are taken into account.