The payment for ecosystem services (PES) emerges as part of an arsenal of tools for innovative domestic financing for otherwise absent markets relating to natural resource management. Its traditional framework aspects of conditionality, voluntary transaction, at least one buyer and seller, and...

Biodiversity provides essential services to human societies. Many of these services are provided as public goods, so that they will typically be underprovided both by market mechanisms (because of the impossibility of excluding non-payers from using the services) and by government-run systems...