Categorize this phenomena as either natural or human-induced.
Ozone layer depletion
Ozone layer depletion is largely a human-induced phenomena.
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize this phenomena as either natural or human-induced.

### Input:
Ozone layer depletion

### Output:
Ozone layer depletion is largely a human-induced phenomena.