Two years ago, Indonesia announced a plan to spend millions of dollars protecting and restoring coral reefs. Indonesia’s reefs are some of the most extraordinary ecosystems on Earth. And this new conservation effort was made possible by something called a debt-for-nature swap. Most countries spend a lot paying off debt to banks, institutions, or other countries.  But with a debt-for-nature swap, countries can off-load some of that debt by committing to environmental protections. [...]