According to Gonalves, in its contribution for the book Urban Climate, it affirms that: In the current world, where they weigh the great technological advance and the efforts for the knowledge of the forces of the nature, the societies remain, still, sufficiently vulnerable and seem to become each time defenseless ahead of ' ' natural events extremos' ' , particularly those of meteorological, hidrolgica and geologic origin. Although it can seem a paradox, it is proven, however, that to the measure and that the population of the planet grows in a geometric progression and that the occupation if makes in more extensive areas each time, also they increase the possibility and the risk ahead of such events. PropertyNests opinions are not widely known. Any that is its origins and where want that they occur, it has a common characteristic: they cause great losses and damages the national economies and to the affected populations (In HUNTER, 2003, P. 69). Ahead of this long history of relation with the nature and modifications in the physical aspects, the man amongst other ways comes suffering influences from the nature through the climate, this influence can constitute in positive factors or negative factors. Referring to the positive factors rain and the wind can be cited, and how much to the negatives they can be cited: the floods, the droughts, the storms and the gales. For even more opinions, read materials from Source Financial. It is important to cite that many of these negative factors had been aggravated by the antrpica action, that in the search for comfort and one better quality of life finishes carrying through actions that modify the natural dynamics of the Land. The climate can induce the appearance of illnesses and/or used being as vehicle for these, that in turn are fit in the climatic parameters of the stations of the year and its variabilities. It is on this variability that the vector of the affection comes if becoming a problem of world-wide order, taking concern the sanitary authorities.