Plastic waste is a big problem for the environment.

He owns a big house.

We must strive to protect the environment of the Earth.

Can you answer this question?

He treats us as a big friend.

He is traveling around the world as an ecologist.

We must strive to protect the natural environment.

We should recycle to prevent environmental pollution.

We need to solve the problem in the production environment.

It took a long time to set up the development environment.