VATICAN CITY (AP) — Pope Francis shamed and challenged world leaders on Wednesday to commit to binding targets to slow climate change before it’s too late, warning that God’s increasingly warming creation is fast reaching a “point of no return.” In an unusually bleak update to his landmark 2015 encyclical on the environment, Francis heightened the alarm about the “irreversible” harm to people and planet already under way and lamented that once again, the world’s poor and most vulnerable are paying the highest price.