1. **Problem:** Identify the underlying logical structure or fallacy in the statement: "Last year's mild winter proves that global warming isn't real." 2. **Formula/Concept:** This is an example of the **hasty generalization fallacy**, where a single instance is used to disprove a broader theory. 3. **Explanation:** Global warming is a long-term trend, not disproved by one mild winter. 4. **Intermediate Work:** None needed as this is a logical fallacy identification. 5. **Final Answer:** The statement commits a **hasty generalization fallacy** because it incorrectly uses one data point to reject a well-supported scientific theory.