Ban That Product or Wait for Proof That It Kills?

A new report suggests an ounce of prevention really is worth a pound of cure, but try convincing corporations of that.

A company releases a product, which may be harmful to public health, but studies assessing its impact are not conclusive. Should government agencies wait until research demonstrates with certainty the adverse effects of a product before banning its use? Or, by then, will the harm to individuals and damage to the environment be irreversible? Is it better to err on the side of caution and take preventative...