Rajat Nag, Managing Director of Asian Development Bank

We've become used to the idea we're living in Asia's century - that China and India are leading an irreversible shift of power from West to East.

Well, maybe its time to challenge the new orthodoxy.

Asian nations face huge unresolved challenges - of poverty, poor governance and environmental degradation.

Stephen Sackur speaks to Rajat Nag, Managing Director of the Asian Development Bank and asks: are reports of Asia's economic advance somewhat premature?