I was unable to find information about the "terrible omen" referenced in the article headline. Closest thing: > In often-fragile ecosystems, reliant on a stab

I was unable to find information about the "terrible omen" referenced in the article headline. Closest thing: > In often-fragile ecosystems, reliant on a stable climate, it is now much easier to see how environmental change might have contributed to the collapse of these ancient civilizations. As a result, many ideas about the collapse of ancient societies, such as those promoted by Jared Diamond - who emphasizes social, political, and economic factors - may require some significant rethinking.