Here are some examples:
* Depleting natural resources: "Overfishing is depleting the world's fish stocks."
* Depleting energy reserves: "The rapid depletion of fossil fuels is a major concern."
* Depleting funds: "Our savings are being depleted by rising medical costs."
The word "depleting" implies a gradual process of reduction, and it often suggests a negative outcome because it's something being used up or lost.