David Eades

Presenter, BBC World News, BBC Radio 4 'The World Tonight'

Jean-Arnold Vinois

Adviser on European Energy Policy at the Jacques Delors Institute, Honorary Director of the European Commission - Directorate General for Energy

TJ Glauthier

US Deputy Secretary of Energy, 1999-2001

Hunter Biden

Independent director at Burisma Group

Joschka Fischer

Vice Chancellor of Germany (1998-2005)