In this series, Earth has been destroyed almost totally by overpopulation and the ensuing ecological collapse.

I really think there is going to be a major ecological collapse.

The two novels feature common characters in a future where Earth has undergone ecological collapse.

Acid rain is not about to cause the sudden ecological collapse predicted by some accounts in the early 1980's.

Yet when their home became threatened by ecological collapse they were willing to attempt an engineering project of even greater magnitude to repair it.

The Azraq wetlands have been described as in the state of "ecological collapse".

Each season the evidence mounts that the national park is being driven towards ecological collapse.

Here, the risks are two: ecological collapse and genetic escape.

What he finds is a world on the brink of ecological collapse.

It is important to look at that, but we must take wider action to avoid ecological collapse.