These entrepreneurs are solving one of the world’s biggest problems - one toilet at a time

A health worker labels portable restrooms at a temporary shelter for Cuban migrants in the town of La Cruz near the border between Costa Rica and Nicaragua, November 18, 2015.Costa Rica proposed a "humanitarian corridor" for Cuban migrants transiting Central America on their way to the United States. Some 2,000 Cuban migrants are at the northern border with Nicaragua, and some 300 Cubans are expected to arrive at Costa Rica's southern border with Panama every day.  REUTERS/Juan Carlos Ulate - GF20000064997

Around the world, 4.5 billion people lack safely managed sanitation, and nearly 2.1 billion people drink unsafe water. Image: REUTERS/Juan Carlos Ulate

Eleanor Allen
Lead Executive, B Lab
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