He had to change the world's plants to make them able to survive in the new, harsh environment.

The 49th state is a harsh environment for salty dogs.

Even in the harsh environment of prison, trust and community can build.

"They offer a gentle way to experience a harsh environment," she said.

The characters don't battle against the harsh environment, but have become a part of it.

However, the surface can be altered by the harsh environment of space.

It would be bad design to let someone go out in such a harsh environment without a way to contact their base.

"Typically, they have to get better terms to produce in harsh environments."

The island's harsh environment took its toll on many of the men.

It looked to me like the harshest environment in the world.