What happens to the unused embryos

Whenever I look at the arguments in the embryonic stem cell research debate, a question always arises in my mind. If taking the stem cells from the embryos is, as opponents claim, murder, then foregoing using them for stem cell research preserves them for what fate? If it's murder to kill them, then isn't leaving them forever and ever in liquid nitrogen any better? What kind of life are we saving them for? If every embryo is sacred, and God gets irate if they are destroyed, are we also wronging them if we don't give them a chance to have a life? At least, the "You could be aborting Beethoven" argument seems not to apply here.  

This is an article about unused embryos, and what happens to them. I'm sure some of you know more about this than I do.