[i]"Those who deny this must go to the scientists and ask them. They speak very clearly," he said, referring to experts who blame global warming on man-made activities.
Francis said scientists have also clearly charted what needed to be done to reverse course on global warming and said individuals and politicians had a "moral responsibility" to do their part.
"These aren't opinions pulled out of thin air. They are very clear," he said. "Then they (leaders) decide and history will judge those decisions."
For those who have denied climate change, or delayed actions to counter it, he responded with an Old Testament saying: "Man is stupid."
"When you don't want to see, you don't see," he said.[/i]