The Pope is infallible when formally defining a dogma regarding faith or morals, to be held by the entire Church.
The Pope is not infallible when yakking at the back of a plane, no matter what he is talking about, and also not when talking or writing about science, or economics, etc.
No matter how stupid, vain, irresponsible, immature, imprudent, or shallow the Pope may be, none of it has anything to do with “infallibility.”
http://theweek.com/speedreads/452937/pope-francis-tackles-climate-change-destroy-creation-creation-destroy
So he’s only the vicar of Christ sometimes but no all the time?
And; naturally; nothing to do with your chosen religions CREDIBILITY; either: right?
Do you like your current pope or not?