Ecology is one of the global problem of the world. We consider that our project is actual because every city and town has problems in ecological, social, economical spheres. People try to solve them. The solutions may be unique. . The president of the Russian Federation announced 20013 the Year of Ecology. It means special attention of the government to the solution of the problem.

 We investigate the development of the relations of two sisters-cities N. Tagil and Chattanooga. United towns may have more successful results. The most interesting system of human and economical connections has been formed. The president of the Russian Federation announced 20013 the Year of Ecology. It means special attention of the government to the solution of the problem.