John Allen has written an op-ed piece in the New York Times (or 'New York Slimes') for the 40th anniversary of Pope Paul VI's Humanae Vitae - the Papal Encyclical condemning artificial birth control. Let me say that John Allen did a great job.
Allen points out that no European nation has a birthrate above 2.1, i.e. replacement level. This means economic and cultural suicide. Who will pick up the reigns? Here's a hint: They wear turbans and often name their sons "Mohammad".
Allen's point about the "success" of Pope John Paul II's 'Theology of the Body' is also helpful:
That’s a claim many Catholics might dispute, but the reading groups and seminars devoted to contemplating John Paul’s “theology of the body” mean that Catholics disposed to defend the church’s teaching now have a more formidable set of resources than they did when Paul VI wrote “Humanae Vitae.”Take a look:
The Pope vs. the Pill in the New York Times.