Decades of food delivery and 'miracle' seeds haven't addressed underlying causes of hunger. But new efforts to replicate Africa's original ecosystems are generating impressive, sustainable results.
With help from a climate-conscious nordic town, four U.S. families lessen their carbon footprint.
Latin America and the Caribbean – where 78 percent of residents live in cities – is the world's most urbanized developing region.
One possibility: Industrial emitters of CO2 partner with landowners to plant forests.
The Worldwatch Institute reports that a growing number of US city-dwellers are raising their own chickens, often in defiance of local ordinances.