Question: when do we celebrate world environment day and why
[{'answer': '5 June', 'provenance': [{'wikipedia_id': '1838622', 'title': 'World Environment Day', 'start_paragraph_id': 34, 'start_character': 90, 'end_paragraph_id': 34, 'end_character': 96, 'bleu_score': 1.0, 'section': 'Section::::Annual themes and major initiatives and accomplishments.:2008.\n'}]}, {'answer': 'for the protection of our environment'}, {'provenance': [{'wikipedia_id': '1838622', 'title': 'World Environment Day', 'start_paragraph_id': 1, 'start_character': 31, 'end_paragraph_id': 1, 'end_character': 705, 'bleu_score': 0.749407863334133, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10097054405896379863}, 'section': 'Section::::Abstract.'}]}]