Question: what event most affected the passage of the national environmental protection act of 1969
[{'answer': 'the Santa Barbara oil spill', 'provenance': [{'wikipedia_id': '531842', 'title': 'National Environmental Policy Act', 'start_paragraph_id': 5, 'start_character': 527, 'end_paragraph_id': 5, 'end_character': 554, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '531842', 'title': 'National Environmental Policy Act', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 968, 'bleu_score': 0.9016628384274831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4290126566999116264}, 'section': 'Section::::History.\n'}]}]