Nowadays, 3,500 million people, more than half of the population, live in urban areas. The expansion of the cities not only has
allowed a quick progress but has also brought problems such as the bad management of natural resources, pollution, lack of basic
services and the increase of marginated areas. The forecast is that by 2050 the equivalent of three planets will be necessary to maintain our style of life. That's why we should converse ours!
