Following an initial report devoted to the prediction and prevention of earthquakes and ground movements, Mr. Christian Kert has extended his study to the other forms of natural disaster : storms, cyclones, avalanches, floods, droughts, forest fires and volcanic eruptions, to which he has added the collapse of mine workings which, although a result of human activities, has very similar consequences. Adhering to his own particular method, Mr. Christian Kert collected a great deal of his information from more than 300 leading figures through interviews in metropolitan France, the French overseas territories and other countries. Although current scientific knowledge is still unable satisfactorily to provide answers to all the questions raised by natural disasters, it is still already possible to propose a number of measures with the potential significantly to improve the situation of those of our fellow countrymen who are exposed to them.