Passage Summary: If countries start labeling GMOs, people will stop buying them, and farmers will switch to even worse options like heavy pesticides, so we should avoid those labels entirely.

Conclusion: Other countries should not implement laws requiring the labeling of genetically altered foods.

Reasoning: Labeling leads producers to remove genetically altered ingredients to avoid consumer avoidance, and the alternatives to pest-resistant genetically altered crops are dangerous and use heavy pesticides.

Analysis: The argument relies on a 'slippery slope' from labeling to environmental disaster. It assumes that the consumer behavior observed in the UK—fearing labels as warnings—will be replicated in every other country contemplating similar laws. To be a necessary assumption, the argument must also believe that the 'dangerous alternatives' are actually worse for the environment than the GMOs they replace. Look for an answer that bridges the gap between the act of labeling and the inevitable shift toward pesticide-intensive farming.