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A new report released today in the Proceedings of the National Academy of Sciences of the United States of America (PNAS) is a call to action for policymakers worldwide seeking to develop sustainable and equitable solutions to our most urgent global challenges.

The number of tree species on Earth

One of the most fundamental questions in ecology is how many species inhabit the Earth. However, due to massive logistical and financial challenges and taxonomic difficulties connected to the species concept definition, the global numbers of species, including those of important and well-studied life forms such as trees, still remain largely unknown. Here, based on global ground sourced data, we estimate the total tree species richness at global, continental, and biome levels.