The Atlantic surveys the landscape, opportunities, and challenges in impact investing.

"In the broadest view, impact investors are simply betting on fundamental trends. In a volatile and resource-constrained world, investments to provide food, water, energy, health care, education and sanitation to a growing and increasingly affluent global population arguably have lower risks and higher long-term returns. But on the ground, even innovative efforts to meet basic needs often are hampered by inefficiencies and market failures that prevent those who create value from getting paid for it.

Enter the financial innovators."