The European industrial revolution meant that production became increasingly industrial and followed by rapid urbanization. More and more people have since chosen or been forced to move to the cities. European countries' urban areas today has more than 400 million inhabitants, which represents 80% of the population. Migration into large or mid-sized cities are not declining. In order to improve their quality of life and attractiveness of cities is the urban development more in focus. A switch to a more sustainable society takes place mostly in the cities. Factors that affect our cities and centers for physical and social environment can be found at several levels of society. The development affected by the policy, research, planning, and how people and market forces interact ........ BUT IS IT SUSTAINABLE TO MAKE WEAPONS??