Increasing urbanization is a powerful trend in today's world: Within the next several decades, UN projections show that over half of the world's population will be located in urban centers. This will require the construction of the equivalent of eight cities of ten million inhabitants every year for the foreseeable future. Discuss what this trend implies for flows of products and residues: food, water, sewage, energy, and so on.Overall, is urbanization environmentally advantageous or disadvantageous? Will it continue in any event regardless of environmental impacts?( 70 words limit )