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 harbour 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 ocean resources in order to fuel an insatiable consumption," he told the cheering crowd.
The 81-year-old pope appeared in good form as he started the official part of his trip after three days of rest. He chatted with young people on the ferry and stepped off sprightly to receive a bear hug welcome by an Aboriginal on the dock.
He told the young people, some of whom had come from island nations threatened by rising sea levels or drought-hit nations such as Australia, that protecting the environment was "of vital importance to humanity".
The pope recalled how his long flight from Rome last weekend, he marvelled at the sparkle of the Mediterranean, the grandeur of the north Africa desert, the lushness of Asia's forests and the vastness of the Pacific Ocean.
"It is as though one catches glimpses of the Genesis creation story - light and darkness, the sun and the moon, the waters, the earth and living creatures," he said.
In a welcoming speech to Prime Minister Kevin Rudd on Thursday morning, the pope said: "It is appropriate to reflect upon the kind of world we are handing on to future generations".
