So here's the question: will we avoid the fate of past civilizations that destroyed their environments, and hence themselves?

So the struggle to transplant Earth's past civilization into the future was begun in the fifty-ninth minute of the last hour.

Cultural "Reservations" are established for the sole purpose of preserving past civilizations.

Too much of past civilizations was built on petrochemicals.

There are a few traces of past civilizations, neither Heechee nor human.

There should be at least as much to learn as from a study of past civilizations.

Occasionally an entire month's issue would be devoted to a single country, past civilization, a natural resource whose future is endangered, or other theme.

We only know about past civilizations through the arts.

"There's massive evidence of a past humanoid civilization here," Roger said.

Nothing in here except the empty shell of a past civilization.