"Those who deny it [climate change] should go to the scientists and ask them," the pontiff said on Monday during an in-flight press conference on the return leg of a five-day Colombia trip. "They speak very clearly." As his charter plane flew over some of the recently devastated areas en route to Rome, Francis added: "I am reminded of a phrase from the Old Testament, I think from the Psalm: 'Man is stupid, he is stubborn and he does not see.'"
He said individuals and politicians had a "moral responsibility" to act on advice from scientists, who had clearly outlined what must be done to halt the course of "catastrophic" warming. "These aren't opinions pulled out of thin air," he said. "They are very clear. They [world leaders] decide and history will judge those decisions." Recalling last month's news that a ship crossed the Arctic without an icebreaker for the first time, Francis said: "We can see the effects of climate change, and scientists clearly say what path we should follow."