Question: when did the sea level start to rise
[{'answer': '20,000 years ago', 'provenance': [{'wikipedia_id': '21171721', 'title': 'Sea level rise', 'start_paragraph_id': 7, 'start_character': 37, 'end_paragraph_id': 7, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Past changes in sea level.\n'}]}]