So knowledge is an important and necessary step - if people don’t know something is a hazard, they will continue to do it in ignorance of the risks it poses to them.

To change behaviour, you first have to make people aware of the consequences of their behaviour. However, as has been said a number of times, knowledge alone is not sufficient to change behaviour. If it was, no one would smoke cigarettes, drive a car or eat most of the food available in HK.

Two terms you might have heard but not be sure what they mean are risk and hazard. Risk is the quantification of a likely outcome occurring; a hazard is something that can cause harm.