Selfishness and greed have been our tools of survival from the very beginning, ever since our earliest forebears climbed down from the trees and set off across the savannah in search of God. Evolution has given us an instinct that is as crucial to our survival as fear or sex but, in the third millennium, greed has become a juggernaut that is steering out of control- The world's most expensive sandwich = o85, London. The world's most expensive dinner = o17,563, Bangkok. A sacked national football coach waiting out his contract = o13,000 a day. he world cannot go on fulfilling the demands we make of it but the juggernaut is showing no signs of slowing down. And yet we can still appreciate the genius of those whose ambitions have created works of art, gourmet food, brilliant technologies . . . panning across a whole range of issues including obesity, American evangelism, the Iraq war and GM food, Greed is not just a lament for lost innocence or an assault on the fat cats - it