if you remove mankind from the planet everything that then occurs is natural .. everything else is manmade/shaped .
this does create some fun questions .. how much of the countryside is manamade after 1000's of years of framing, lumbering , chaging water courses /levels .. which animal are natural or manshaped by breeding ... same for fruit and veg ....
and leads on to if you bio enginner a plant to produce more of a substance .. is that substance still naturally good for you ??
The only things that are not truly natural are those things that people invent to make excuses for their bad behaviors...like God, original sin, saviorism, virginal mothers, and holy ghosts.
do you include .. freedom, justice, love, hate, politics..left right and center ,economics ,social order , morality ,etiquette in your list of unnatural's ?