There are temporary exceptions for numerous Red List items due to current limitations in the materials economy. (living-future.org)
The authors concluded that 36 to 57 percent of the Amazon's estimated 15,000 tree species likely qualify as globally threatened under IUCN Red List of Threatened Species criteria. (sciencedaily.com)
Much of the reason for the oversight is simply because there are few spider species on Red Lists of threatened species, and because fewer than 20 % of studies show a harmful effect on arachnids. (treehugger.com)