Risk is the basis of probability and determines decisions. This definition distinguishes risk from uncertainty in which probabilities are unknown. Nowadays there is an increasing awareness of the fact that risks and vulnerability are no more limited to individual activity but they potentially spread outside the individual sphere of control, i.e. threatening the survival of humanity and the natural environment. Dimension, intensity and quality of risks and vulnerability calls for involving people and social communities. Control has to be applied at a local level within a global awareness and action to prevent and react to the risk.