Pope Benedict XVI denounced same-sex marriage as a "threat to creation." This comes in the wake of several heavily Catholic countries (Portugal, Argentina, and Mexico, among others) legalizing or considering same-sex marriage in part or all of their lands recently. His argument was positively goofy, framing same-sex marriage in terms of a threat to the environment.
Here's a Reuters story about his speech.
It's not the pope's first attack on same-sex marriage, but I thought it was notable for achieving new levels of intellectual flimsiness.
Same-sex marriage is already legal nationwide in one majority-Catholic country, Spain. So apparently the pope's argument isn't getting the kind of traction he'd prefer, even within his own church.