This finance assignment discusses critical review on BHP and other case studies on sustainability including a case of tailing storage facilities, corporate social responsibilities, a test of legitimacy theory, and a study of a multinational gas company. The report evaluates BHP's sustainability report and its approach towards social, economic, and environmental components. It also highlights the importance of corporate social responsibility and the need for regulatory bodies to supervise it. The paper also discusses the use of legitimacy theory in making annual disclosures in financial statements and the disclosure requirements of companies in case of environmental disasters. The study concludes that extensive research is required in these areas.