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anthropocène focusclimat
Plutonium spike in Canadian lake sediments marks dawn of new epoch in which humanity dominates planet
Only if there is a fundamental change in the way we manage land we can reach the targets of climate-change mitigation, avert the dramatic loss of biodiversity and make the global food system sustainable.
The Anthropocene Working Group has taken a major step towards identifying a “golden spike” location to be used in the formal definition of the Anthropocene. In public meetings held this week, during the Unearthing the Present conference in Berlin, the AWG introduced their Anthropocene short-list — 12 possible candidates for a unique reference location that clearly indicates the beginning of the new epoch.
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.
