This park is known as a local energy spot.

We should increase the use of alternative energy to protect the earth.

We should save electricity for energy conservation.

He thinks that war is a necessary evil.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

Are you really not going to use this unused laptop?

He is the most competent employee of our company.

Who is the user of this software?