This issue has quickly become linked with the issues of abortion and embryo research.
Cloning is a way of producing a genetic twin of an organism, without sexual reproduction.
A tiny electric pulse may then stimulate development of the resulting embryo, which is an almost exact genetic twin of the creature that supplied the nucleus. It may be technically possible to use this procedure to reproduce human beings. A great deal. Cloning a human being or other large organism begins by artificially producing an embryo of that species. Experiments in human cloning would involve the creation and destruction of human embryos on a massive scale.