 In a 2006 study, an ecologist at Wageningen University & Research claimed that, by the late-1990s, "Boswellia papyrifera" trees in Eritrea were becoming hard to find.In 2019, a new paper predicted a 50% reduction in "Boswellia papyrifera" within the next two decades.This species, found mainly in Ethiopia, Eritrea, and Sudan, accounts for about two-thirds of global frankincense production.