2,500 leaders from business, government and civil society are in Davos for the World Economic Forum Annual Meeting.

The theme is a call to action for decision-makers to use the opportunity of the five-day meeting to "Improve the State of the World: Rethink, Redesign, Rebuild".

Nicolas Sarkozy, President of France, will deliver the opening address in a plenary session following the traditional welcome by the Swiss President, Doris Leuthard.

Leaders will participate in over 200 working sessions on topics including Haiti, the Millennium Development Goals, the environment and the economy.