"Useful biological materials" are defined as those demanded by the human economy.

Explaining biomimicry gets him started on how rooted in nature even human economies are.

And the city's human economy cannot afford further excise or sales taxes.

Many facets of the interaction between sea otters and the human economy are not as immediately felt.

This is said to be greater in size than the entire human economy.

What would happen when the human economy was utterly dependent on the trickle of good stuff from the sky?

We need more drugs like coffee - cheap, effective, non-damaging, and which contribute to human economy.

The Investors recycled the riches they tapped from the human economy.

Virtually everyone agrees that without the natural world, the human economy and indeed human life could not exist.

The human economy depends on the concept of androids as property.