Passage Summary: Genetically modified crops are being used so quickly and with so little oversight that they might damage the environment. Since one crop already harmed butterflies, we should require strict testing for every new crop before it's released.

Conclusion: Rigorous safety testing should be required for any new genetically engineered crop before it is put into production.

Reasoning: Current monitoring is loose and adoption is fast, creating significant ecological risks, as seen when a previous crop threatened monarch butterflies.

Analysis: The argument moves from a set of facts about risks and past harms to a 'should' statement about policy. To justify this leap, we need a principle that bridges the gap between 'potential risk' and 'mandatory testing.' Look for a conditional rule that states if a process poses a significant risk or has caused past harm, then rigorous preventative measures are required. The correct principle will likely turn the environmentalist's specific concern into a general requirement for safety.