The world needs to add about a billion homes to meet the demand for urban housing. An "incremental" approach, where the urban poor work with the government in constructing their own homes slowly over time, can help.
Natural infrastructure, strategically managed natural and open spaces like forests or wetlands, can direct more clean water to cities by controlling water flows, preventing sediment buildup and absorbing pollutants before they flow into waterways.
New research from the International Energy Agency shows that cities represent 70 percent of the cost-effective emissions-reduction opportunities between now and 2050. Director for Sustainability Kamel Ben Naceur shared this and other findings at a recent WRI event.