Life has numerous treaties and conventions that everyone has to face besides happiness. Climate change and demographic expansion inseparably combine an unprecedented challenge to cities. Admittedly, leaders worldwide need more time to allocate respective responsibilities and duties as far as global climate change is concerned. Thus, new impetus has to be formed from the turn of twentieth century – an era which witnessed two major world wars and the birth of United Nations Organization (UN). When the UN was founded in 1945, two thirds of the world’s people lived in rural settings. By 2000, the population balance had shifted, with half of humanity now living in cities.