Kofi Annan, Columbia Global Fellow at the School of International and Public Affairs and former Secretary-General of the United Nations

Maude Barlow, senior adviser on water to the United Nations and author of `Blue Covenant: The Global Water Crisis and the Fight for the Right to Water`

Joachim von Braun, Director General of the International Food Policy Research Institute (IFPRI)

SIPA hosted Lord Nicholas Stern, British economist and former head of the UK's Government Economic Service.

Nicholas Stern, IG Patel Professor of Economics and Government at LSE and chairman of LSE's new Grantham Research Institute on Climate Change and the Environment.  Chair: Howard Davies