1. **Problem:** Identify the logical structure or fallacy in the statement: "Last year's mild winter proves that global warming isn't real." 2. **Formula/Rule:** This is an example of the **hasty generalization fallacy**, where a single instance is used to disprove a broader theory. 3. **Explanation:** Global warming refers to long-term trends, not single events. Using one mild winter to deny global warming ignores the overall data. 4. **Intermediate Work:** None needed as this is a conceptual identification. 5. **Final Answer:** The statement commits a hasty generalization fallacy by incorrectly using one data point to refute a well-supported scientific theory.