Roughly 1/4 of all known bee species have not been seen since the 1990s.

Quoting the bullets from the intro to the report:

* The number of bee species found each year in GBIF data has declined since
the 1990s

* Approximately 25% fewer species were found between 2006 and 2015 than
before 1990

* As records increase as a result of enhanced data mobilization, analysis
uncertainty decreases

They've got tables and graphs and such, but reading this sort of thing is
hard.  Not difficult to do, but emotionally hard to do.


"Worldwide occurrence records suggest a global decline in bee species
richness"

DOI:https://doi.org/10.1016/j.oneear.2020.12.005

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