Urban Ecology: the green within the city
The continuous urban development associated with the growth of the world population has become one of the most important challenges of the present time. Today, cities accommodate more than 54% of the world's population, a proportion that is expected to increase to 70% by 2050. Trends in urbanization show that cities are becoming more complex and heterogeneous social-ecological systems with growing demand for natural resources mainly for infrastructure, housing, food, water, and energy.