Why is energy efficiency important to society's need to be efficient with energy usage?

To save the unnecessary bills and carbon emissions.

Explanation:

Energy efficiency is important to society in the following ways:

1. It saves the unnecessary bills as buildings who are using energy efficiently have less demands.

2. Saving energy for the future generations as we know low demand would save the sources.

3. Energy efficiency is also important to society in environmental ways at efficient energy means low carbon emissions.