If all one had seen of the world's youth were the pelvis-thrusters on MTV and the pubescent darlings of Teen Beat, one might wonder whether they had just arrived from hell in a handbasket. Images of Britney Spears, Eminem and black-hooded protesters rampaging through the streets of the world's capitals may be cause for concern, but the publicity tends to be grabbed by young people in rebellion against authority. Anna Halpine and her fellow members of the World Youth Alliance (WYA) are pursuing a very different path. Rather than parade before the television cameras with amorphous grievances that were...