Demand for environment-focused “green bonds” is on the rise. They could help the private sector save the climate. Just over 100 years ago, the United States found itself embroiled in a world war, but with few options to finance its efforts. In 1917 the first “Liberty Bond” was issued. Over the next year, millions of Americans out of a sense of patriotic duty purchased the bonds. The war for the future of the planet now has its own version of the Liberty Bond: “Green bonds.” And these climate-aware investments are…