Question: who creates the most pollution in the world
[{'answer': 'China', 'provenance': [{'wikipedia_id': '1716015', 'title': 'List of countries by carbon dioxide emissions', 'start_paragraph_id': 3, 'start_character': 87, 'end_paragraph_id': 3, 'end_character': 92, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]