1.suspected health hazards in the environment should be eliminated.Because it it dangerous to human's health.we can cite some examples to indicate that how serious the problem is.
2.But it is not wise to conduct the action when the scientific studies of these health hazards are incomplete or contradictory.Without sufficient evidence, the government make prudential decision to try this action.Becasuse sometimes things we suspect hazardous prove to be undangerous or even be good to other aspects.
3.It is better to decisice what is going to do after the scientific result testifies the substance to be hazardous in human's health with certainty and whether it is serious enough to take action.
|