Rough road to sustainable development

More than a decade after the UN Conference on Sustainable Development in Rio de Janeiro, Brazil, the world is still scrambling to meet its ambitious targets. An estimated 1.5 billion people remain without safe drinking water and about 2.5 billion have no access to adequate sanitation. Almost 1 billion people, most of them in developing countries, live in slums, a figure expected to double over the next 30 years.