This article depicts hazard mechanism of cadmium to plant and human, main sources of cadmium in soils, and investigations on cadmium pollution in city-outskirts and around mines.

Artificially triggered lightning has practical use in the study of lightning strike mechanisms, lightning hazard and protection as well as in the propagation of radio wave and plant mutation breeding.

The technique of hazard and operability studies(HAZOP)has been developed to provide a systematic method for analyzing the causes and effects of abnormal plant operation.