Fifty percent of people on the planet live in cities, and the urban population grows by two people every second. Ninety three percent of this urban growth is occurring in poor or developing countries, and nearly forty percent of t...

Projections show that in 2050 global population will have increased to 9 billion people and 70% more food will be needed. Over 70% of global water availability is used for agricultural production. Electricity generated from water,...