The cause of this warming trend is a matter of long and unresolved debate.

At the heart of the issue, though, is an unresolved debate over the very function and focus of a principal.

His report captured the country's imagination and led to a still unresolved debate over how the arid lands should be managed.

There has been considerable and as yet unresolved debate over the classification of mountain gorillas.

There is an unresolved debate whether this large and distinct group is not better treated as a full species.

It is an unresolved debate, because neither approach was given much of a trial.

But their accounts have stirred an unresolved debate about their credibility.

But with that debate unresolved, engineers said, the collapse remains one of the deepest mysteries their profession has faced.

Since 1975, 18 small dams in the Emigrant Wilderness have been the source of an unresolved political debate.

Mexico's unresolved historical debate about the form and purpose of an independent nation was resuming.