It only took two days for Nigeria to raise $59 million through green bonds -- part of a funding drive for climate and environmental projects in a nation still hooked on oil. Green bonds are similar to sovereign bonds: Investors are paid interest on what is essentially a loan to the government, but in this case the money funds environmentally friendly projects.

It only took two days for Nigeria to raise $59 million through green bonds -- part of a funding drive for climate and environmental projects in a nation still hooked on oil. Green bonds are similar to sovereign bonds: Investors are paid interest on what is essentially a loan to the government, but in this case the money funds environmentally friendly projects.