SYDNEY (Reuters) - Pope Benedict on Thursday told a huge gathering of young people that they were inheriting a planet whose resources had been scarred and squandered to fuel insatiable consumption. His latest appeal to save the planet for future generations came in a address to some 150,000 youths in Sydney after he rode through the city's harbor standing on the outdoor deck of a white ferry as dozens of boats blew their horns. "Reluctantly we come to acknowledge that there are also scars which mark the surface of our earth, erosion, deforestation, the squandering of the world's mineral and...