What is the division between natural and un natural?

Answer 1

I think this would have to be context dependent. I can say a built dam is artificial in opposition to dams that occur 'naturally' when rock falls block water flow but beavers also build dams. Does this make a beaver's work unnatural?

I can call transgenics or genetically modified food, moving genes between organisms that are not even close phyogenetically, unnatural but many species other that humans can do this. Lateral transfer of genes between organisms may be as old as cellular life. Maize has transposons, bacteria have plasmids, virus' are little more than mobile genetic elements ready to move any and all DNA. Viral replication is known to abscond with host DNA as a new part of the viral genome then insert the stolen DNA in another host cell resulting in a new sequence in the host. This occurs across species. Recombination is a powerful tool for evolution.
A known benefit conferred by viral genes in humans is a sequence, installed by a retrovirus, that regulates the amylase gene cluster, allowing us to produce amylase in our saliva. This sequence, that we share with a few other primates, enables us to eat starchy foods. - Coffin, John M.; Stephen H. Hughes and Harold E. Varmus, Eds. Retroviruses, Cold Spring Harbor Laboratory Press, 1997. p 403.
Are corn, bacteria and viruses being unnatural when they create transgenic mutants? In context, this is a natural evolutionary method of change. Note that it is natural so there is no pre-selection for benefit, neutrality, or harm from the change. The outcome is random.
What is different from nature is our desire for predictability in the outcome. We want only beneficial changes with no long term detrimental effects from any transgenic organisms we create or rivers we dam.
Natural events are random so as soon as we attempt to select a specific kind out outcome from our actions we are being teleocentric, result oriented. Nature has no goal, no direction no expected result. Are humans, choosing to have goals with specific results that natural phenomena can't, unnatural?

Answer 2

OK, well I was going to try to impress you with huge long explanation it was even going to be a "cut and paste" thing,,,which btw i learned to do yesterday (on accident) lol and being it's 8am I'm going to say natural is when we let things happen the way (nature) intended (unnatural) is when us humans mess with mother nature! artificial, synthetics,,,i have to admit i am i big (huge)fan of the (unnatural childbirth) I wanted the best drugs insurance could buy =)

Answer 3

Natural - something which happens or exists in nature.
Un natural - something which does not happen or exist without an specific external force to make it happen or exist.