Jeffrey Sachs, director of Columbia University's Earth Institute: Governments meet in Doha this weekend to review the global system of development financing, the means by which resources flow globally to support sustainable development. The system is broken, though the conferees are unlikely to say so clearly.

Just as we need an overhaul of financial market regulation, we also need an overhaul of development finance, if we are to address problems of poverty, hunger, and climate change.