Just because he is not speaking Ex Cathedra, doesn't give you free reign to ignore or disregard his statements. He is the Pope, afterall, in direct succession from Peter who Jesus founded the Church upon. You might want to give him a little extra credence, especially if you think you disagree with him.
Hogwash! The Apostles never claimed they had any expertise other than in Christ. What does an expert in doctrine know about economics or environmentalism.
This is the same as an actor or singer speaking off topic. Unless it's the Good News, the Pope is speaking off topic and has no special authority.
I will admit that living according to God's truths do have an impact on our Earthly lives, but this is just plain silly.
Oh? Just because you accept all of that controversial stuff, and accept that he is infallible, DOES NOT mean that everone else is not free to ignore and disregard his pronouncements.