The 2007 Lectures are given by one of the world's foremost economists, Professor Jeffrey Sachs.
The audio webchat took place at 8.45pm on Wednesday 9 May 2007. Evan Davis, the BBC's economics editor, put questions from the public to Prof. Sachs about his proposals fro reform. You can listen to it again below.
The key political novelty of our age is mass political awareness and mobilization. Mass mobilization has brought the Age of Empire to an end, and accounts for the failures in Iraq. Social mobilization can be a dramatic force for positive change.
Jeffrey Sachs argues that the world faces challenges on an unprecedented scale - the destruction of the planet through global warming, terrorism, extreme poverty, disease and bad governance. Discover more and about the solutions he offers.