There is precisely nothing, apart from ignorance, that isolates a church from science. It is worth nothing that the ignorance to which I refer is both yours and the church's.
The point of a faith is to reconcile the human desire for knowledge with the understanding of the unknowable. Humans are smart enough to grasp that there is a limit to our observations. Common limits are the experience after biological death, the spacial boundaries of the universe, and the historical events prior to the Big Bang. These are things that currently we do not know about, and cannot know about, beyond vague guesses. Those guesses are a mix of the very-limited theories we have (like assuming that the rules of our universe extended before our universe had formed) and pure faith. It is just as reasonable to say that a God created our universe as it is to say that another universe deformed and spawned our dimensions.
Between the extremes of "known" and "cannot be known", however, there is a wide gap of "we don't know yet", and that is the domain of science. Science gives us the ability to know more, and push the unknowable limits out further. We may be able to invalidate a few religions with our discoveries, but there will always be certain limits to our knowledge, and beyond those limits, faith will still hold sway.
There are a few churches that have not only accepted the role of science, but embraced it. Now the pope is saying that climate change is not a matter of faith, but of science. He's acknowledging that we know enough about our planet to know that we can affect it, despite previous assertions by more-ignorant church members that only God could affect a planet's climate. This does not invalidate the religion, but merely declares that science is still something for humans to deal with, not deities.