In this paper I discuss appeals to nature, a particular kind of argument that has received little attention in argumentation theory. After a quick review of the existing literature, I focus on the use of such arguments in the public controversy over the acceptabil-ity of genetically-modified organisms in the food industry. Those who reject this biotechnology invoke its unnatural character. Such arguments have re-ceived attention in bioethics, where they have been analyzed by distinguishing different meanings that “nature” and “natural” might (...) have. I argue that in many such appeals to nature the main deficiency of these arguments is semantic, in particular, that these words cannot be assigned a determi-nate meaning at all. In doing so, I rely on semantic externalism, a widely accepted theory of linguistic meaning. (shrink)

Food is sometimes labeled as ‘100% natural’ or as containing ‘all natural ingredients’. There is however controversy on how to justify, design and implement such labelling. This paper argues that since naturalness is not one single concept, but several ones, and those concepts typically allow degrees, so that things can be more or less natural, thus, this complexity should be reflected in labelling of foods. There is no obvious way of presenting an aggregate measure of a particular food item’s naturalness, (...) and therefore a graphical representation that contains several axes, with the degree of naturalness represented on each axis, is considered. Such a mode of representation might however be too complex to be practical, and a possible compromise would be to settle for a small number of labels that represent some common combinations of degrees of naturalness along the axes. (shrink)