def get_impact_type_list(data):
    """
    get_impact_type_list returns a list of impact types extracted from data.json 'global_impact_scores' list.
    Variable:
    - data strcuture loaded form data.json
    """
    result=[]
    global_impact_details=data.get("global_impact_details",None)
    for global_impact_detail in global_impact_details:
        impact_type = global_impact_detail.get("type",None)
        if impact_type:
            result.append(impact_type)
    assert(type(result) is list)
    return result