Four strands run through the format of the festival weekend - two on each day - allowing in depth examination of a subject. Select a strand below to find out more.
The Credit Crunch Demystified - China has been keeping the US afloat
"As ever, the Battle of Ideas is full of stimulating and lively argument. It's fun to be able to clash robustly in a good-humoured atmosphere."
Martin Wright, Editor in chief, Green Futures