== Tilbagegang for insekter ==
{{Uddybende|Fald i insektpopulationer }} 
[[Fil:Percent of insect species.svg|thumb|right|Insekter med bestandstendenser, dokumenteret af [[International Union for Conservation of Nature]], for ordenerne [[springhaler]] ([[Collembola]]), [[Hymenoptera]], [[sommerfugle]] ([[Lepidoptera]], [[guldsmede]] ([[Odonata]]) og [[græshopper]] ([[Orthoptera]]). Af 203 insektarter, der havde sådanne dokumenterede populationstendenser i 2013, var 33 % i tilbagegang. <ref name=Dirzo2014>{{citation |first1=Rodolfo |last1=Dirzo |author-link1=Rodolfo Dirzo |first2=Hillary |last2=Young |first3=Mauro |last3=Galetti |first4=Gerardo |last4=Ceballos |first5=Nick |last5=Isaac |first6=Ben |last6=Collen |title=Defaunation in the Anthropocene |journal=[[Science (journal)|Science]] |date=25. juli 2014 |volume=345 |number=6195 |pages=401–406 |doi=10.1126/science.1251817 |pmid=25061202 |url=http://discovery.ucl.ac.uk/1436030/1/Collen_Dirzo%20etal%202014%20Science%20Accepted.pdf |access-date=28. april 2019 |archive-url=https://web.archive.org/web/20170922095643/http://discovery.ucl.ac.uk/1436030/1/Collen_Dirzo%20etal%202014%20Science%20Accepted.pdf |archive-date=22. september 2017 |url-status=live |bibcode=2014Sci...345..401D |s2cid=206555761 }}</ref>]]
Geologi