This is the first step in a process that experts hope will result in an understanding of what scientists are calling a relatively new ecological phenomenon.

Ice water and soil make a unique ecological phenomenon.

These terms describe the human ecological phenomena marking this unique turn in the evolution of Earth's history.

The real problem, they argue, is the uneven distribution of the food supply, which is not an ecological phenomenon but a political and economic one.

Sophisticated models of ecological phenomenon are not new.

It's a natural ecological phenomenon.

Ecological fitting can occur by a variety of mechanisms, and can help to explain some ecological phenomena.

But the migration itself is an ecological phenomenon found nowhere else in the world.

Many were economic, ecological, technological, political and criminal phenomena that warplanes and smart bombs cannot combat.

Every 48 years, a cyclic ecological phenomenon called Mautam leads to widespread famine in this region.