Right livelihood with modern (potentially dangerous) products

Besides right livelihood described by Buddha, we also have to avoid action that is harmful. Some people claim that the long-term side effects associated with various modern products are unknown, or unpredictable at best: including products such as GM foods, EM radiation from cell phones and power transmission lines, etc. If you worked in an industry which makes or sells products like these, would you consider this as right livelihood or not? Note that since this is not a science forum, I don't want to discuss whether these examples (GM foods or EM radiation) are actually harmful, these are just examples of a more general question. I would love to hear your thoughts about how to consider the question from the perspective or right livelihood.