Book excerpt: "A new wave of investors is using impact investing to address some of the greatest challenges of our time--from climate change and water scarcity to lack of access to health care, education, and affordable housing--with the intention of also generating a financial return. This couldn't happen at a more critical time. While philanthropy continues to be a transformative force for good, global philanthropic funds, even when combined with the development or aid budgets of many national governments, add up to mere billions of dollars ... Rockefeller Foundation president Judith Rodin and Margot Brandenburg, two of the foremost experts in the field, explain what impact investing is, how it compares to philanthropy and traditional investments, where opportunities are evolving around the world, and how to get started ..."--Publisher description