Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Categorize this document according to its subject matter

### Input:
This document is about the importance of preserving our environment for future generations.

### Response:
This document can be categorized as focusing on environmental conservation and sustainability.  It discusses the importance of taking action to preserve the environment for future generations.