When people decide to use resources in the environment carefully what is it called?

When people decide to use resources in the environment carefully, it's called sustainable development.

Here's why:

* Sustainable development aims to meet the needs of the present generation without compromising the ability of future generations to meet their own needs. This means using resources in a way that doesn't deplete them or harm the environment.

* Conservation is another term often used, which focuses specifically on protecting and managing natural resources.

* Resource management is a broader term encompassing all aspects of how we use and control natural resources, including sustainable development and conservation.

So, using resources carefully is an essential part of sustainable development, conservation, and responsible resource management.