English references

Tree diversity is fundamental for forest ecosystem stability and services. However, because of limited available data, estimates of tree diversity at large geographic domains still rely heavily on published lists of species descriptions that are geographically uneven in coverage. These limitations have precluded efforts to generate a global perspective. Here, based on a ground-sourced global database, we estimate the number of tree species at biome, continental, and global scales. We estimated a global tree richness (≈73,300) that is ≈14% higher than numbers known today, with most undiscovered species being rare, continentally endemic, and tropical or subtropical. These results highlight the vulnerability of global tree species diversity to anthropogenic changes.

Dennis Meadows: The notion that there is some kind of fairly attractive sustainable society ahead of us if we can only find it is now a fantasy. The global population, its use of materials, its generation of wastes has grown so far above the sustainable capacity of the planet that there is nothing ahead [of the kind] that the sustainable utopia people are talking about.