We live in a time of unprecedented challenges, both at home and across the globe.

The opposition groups are still small in number and national reach, but their very existence represents an unprecedented challenge for the president.

What he does not mention is that one group had an unprecedented challenge, the other a familiar brief.

With no active intervention most of its poorer residents will face unprecedented challenges in meeting their basic requirements.

All over the world, industries face unprecedented environmental challenges.

The seven billionth person joins us at a time of unprecedented global challenge.

This represents an unprecedented challenge on the political, economic and social levels.

Managing the impact of globalisation, both at home and across the world, represents an unprecedented challenge.

I believe that is the spirit in which we must confront this unprecedented challenge for the European Union.

Every other 'unprecedented' challenge of the past has been overcome.