Question: when was the environmental protection agency formed and what is its purpose
[{'answer': 'December 2 , 1970', 'provenance': [{'wikipedia_id': '58666', 'title': 'United States Environmental Protection Agency', 'start_paragraph_id': 10, 'start_character': 613, 'end_paragraph_id': 10, 'end_character': 630, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'the purpose of protecting human health and the environment by writing and enforcing regulations based on laws passed by Congress'}, {'provenance': [{'wikipedia_id': '58666', 'title': 'United States Environmental Protection Agency', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 701, 'bleu_score': 0.629910442019695, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13322874618135533900}, 'section': 'Section::::Abstract.'}]}]