Activities of business enterprises are getting more influence on the society, holding them accountable in terms of corporate social responsibility (CSR). From analyzing the case of Hung Nghiep Formosa Ha Tinh Steel Company Limited, this chapter is a case of the environmental responsibilities of business enterprises and their impacts to stakeholders, that is, environmental CSR. The chapter are presented in the four main parts: (i) understanding the CSR concept and its importance, (ii) briefly review the guidance of the International Organization for Standardization ISO 26000: 2010 on environmental CSR, (iii) figuring out which CSR issues this typical case incurs, and (iv) making recommendations for protecting environment under the umbrella of CSR.