Nat Geo Explorer: Sasha Kramer

As an ecologist, Sasha Kramer fights Haiti’s most pressing health, economic, and environmental problems, one toilet at a time. In 2006, she started a nonprofit, Sustainable Organic Integrated Livelihoods (SOIL), which developed dry composting toilets for people in Haiti that turn human waste into nutrient-rich fertilizer. Less than 20 percent of the country's population has access to sanitary toilets. Following a successful trial run of the toilet her organization developed, she hopes to turn the project over to Haiti's own government or entrepreneurs.