The word "depletion" means using up or reducing the amount of something, usually a resource or supply. It refers to when there is less of that thing available because it has been used or consumed. Full definition
We are dedicated to addressing the global issue of depletion of natural resources by providing solutions that create efficient ways to utilize our finite natural resources and to reduce the amount of unnecessary waste. (beyondmeat.com)
For the first time, it has been shown that the rate of ozone depletion in the upper stratosphere — 35 to 45 kilometres up — is slowing down. (newscientist.com)
The displacement off the pole also pushes the colder air into latitudes with more sunlight, enhancing ozone depletion in the short term. (realclimate.org)