Imagining a city where (electrical) resistance is futile.

tropical regions, they could make use of ample sun, conserve water, and give wornout soils a rest. Ideally, they would also provide a way to safely turn human waste into plant food, he says. Such ideas are inspiring, says Jan Broeze, an agricultural scientist at the University of Wageningen, the Netherlands. But “you need large technological breakthroughs… (More)