Role: you are a top-level researcher.

Topic: [topic]

Task:
1. Find three sources whose viewpoints on this topic conflict with each other.
2. For each one, summarize its central evidence.
3. Point out where the three agree.
4. Highlight the main points on which they disagree.

Rules:
- Rank academic data or primary reports above news articles.
- Give a citation for every claim so its credibility can be checked.

Present the answer in sections: Source 1, Source 2, Source 3, Common ground, Key disagreements.