The cloning of animals has been occurring for a number of years now, and this has now opened up the possibility of cloning humans too. Although there are clear benefits to humankind of cloning to provide spare body parts, I believe it raises a number of worrying ethical issues.
Due to breakthroughs in medical science and improved diets, people are living much longer than in the past. This, though, has brought with it problems. As people age, their organs can fail so they need replacing. If humans were cloned, their organs could then be used to replace those of sick people. It is currently the case that there are often not enough organ donors around to fulfil this need, so cloning humans would overcome the issue as there would then be a ready supply.