Cloning

Cloning is the idea of replicating the DNA of a living organism which results in an exact duplicate. The first successful cloning resulted in Dolly the now famous sheep who lived until age six.
Today some animals, particularly dogs are being cloned by their owner to keep a part of them alive. In most scientific circles the ambition of cloning a human being is frowned upon(my physiology professor said so), mostly because there is nothing new to gain from a clone of a human being, but possibly more trouble. Because clones have no other similarities passed their identical genetic makeup, it is absurd to argue that clones can fulfill the gap left by the original. Since clones will have different behaviors and social attitudes, they will most simply cause overpopulation.  As a result human clones have no basis.
Some might argue that they could be used to harvest organs for their owners, the trouble with this line of thought is that clones are known to live for a very short period of time about six years and then they expire. It is still unknown why they do so.
Therefore human cloning is simply bad.
This is not to say cloning is completely useless. It currently finds it's use in the food industry where  original animals are cloned and bred, then sent out to market. This practice has placed the food industry at an advantage, because they have more options and possibly cost effective (long term) ways of producing their goods.
Keep in mind that cloned animals differ in physical and physiological characteristics from their non-cloned counter-parts, because their DNA is modified during the cloning process causing some genes to be affected. This begs the question of how healthy these are for our consumption in the long term, because gene modification sometimes leads to unfortunate circumstances. Are we simply paving the way for hereditary diseases that can cross over from animals to humans and feeding into the jaws of massive over consumption and increase obesity and diseases, because the more food is available the more people will consume.