Pope Francis said on Sunday that recent heat waves in many parts of the world and floods in countries such as South Korea showed that more urgent action is needed to tackle climate change. "Please, I appeal again to world leaders to do something more concrete to limit polluting emissions," the Pope said at the end of his Angelus message to the crowd in St. Peter. "It is an urgent challenge, it cannot be postponed, it concerns everyone. Let's protect our common home," added the Pope. (Reuters)