ORLANDO, Fla. — America's Roman Catholic bishops say in a new document that embryonic stem cell research carries grave moral risks.

The bishops approved the statement overwhelmingly at their national meeting Friday in Orlando.

The document contains no new teachings, but the bishops want to emphasize church opposition to the procedure since the issue is coming up on state ballots and in policy debates during this election year.

Advocates for the research say that banning scientific use of embryos would halt promising efforts to treat diseases such as cancer and multiple sclerosis.

But the bishops said no greater good can come from using then discarding the embryos, which they consider innocent human life.