Question: identify and describe three of the challenges facing coastal environments in the 21st century
[{'answer': 'tsunamis created by submarine earthquakes', 'provenance': [{'wikipedia_id': '34688121', 'title': 'Coastal hazards', 'start_paragraph_id': 1, 'start_character': 286, 'end_paragraph_id': 1, 'end_character': 327, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'landslides', 'provenance': [{'wikipedia_id': '34688121', 'title': 'Coastal hazards', 'start_paragraph_id': 1, 'start_character': 332, 'end_paragraph_id': 1, 'end_character': 342, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'major cyclones accompanied by high winds , waves and surges'}, {'provenance': [{'wikipedia_id': '34688121', 'title': 'Coastal hazards', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 461, 'bleu_score': 0.970795021215021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1717116148101092741}, 'section': 'Section::::Abstract.'}]}]