NOAA lists 20 coral species as threatened under the endangered species act.

[KPG007]

Originally Posted by Scythanith

I understand how our hobby can have a negative effect on the reefs of the world but we are hardly the biggest offender!

From the Reefbuilders article I linked to above:
For its part, NOAA did state that “collection and trade [for the aquarium industry] was ultimately ranked as a low level threat to corals in general.”