"We cannot just look for the highest possible return at no matter what cost to the human environment," he said.

Before the transition to modern society, there was but one human environment.

"Each of these areas was once a completely modified human environment," he said.

The couple's close collaboration led to several books on a philosophy of the human environment.

"What we must try and do is create a human environment for them to pursue their destiny."

People in relating to their human environment have object relationships.

"They're really part of the human environment and they have some striking features in common with us, acute vision, for one."

Sociology is concerned with human environments as related to social and cultural conditions.

Ultimately, every manufactured product in human environments comes from natural systems.

They will be in a wide range of human environments like cars, homes and offices.