The aim of this paper is to clarify the ethical issues surrounding GM crops by examining the various stages or levels in their development, production, and consumption. Previous work about the acceptability or non-acceptability of GM crops has tended to conflate these various levels, partly as a result of which GM crops are all-too-often simply said to be ``good'' or ``bad.'' There are, though, various problems with such a binary categorization. I look in particular at the duties of scientists, companies, regulatory systems, farmers, retailers, and consumers.