In the 1990's, and well into the next century, the central challenge for America will be economic, not military.

That will be the central challenge for the next mayor of New York.

That is the central challenge facing the next Labour government.

Growth in spending on health care programs remains the central fiscal challenge facing the nation.

The central challenge for the party's new leadership is how to remain relevant to a rapidly changing society.

Yet it is the central challenge of any elected official.

A central challenge is the extent of Kurdish power and independence.

Long-term food security is one of the central challenges of the common agricultural policy.

This is another important, central challenge for the Europe of the future.

So we must now meet these two central challenges.