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...

The geographical distribution of African natural gas resources is going through a period of profound change as new gas discoveries in East Africa emerge to reshape the continent's energy landscape. This region is rapidly establishing itself as a world-class natural gas province and two countries...