ESG数据来源: Paulikas et al, Where Should Metals for the Green Transition Come From? April 2020 White Paper; D. Paulikas, S. Katona, E. Ilves, S.H. Ali, “Life cycle climate change impacts of producing battery metals from land ores versus deep-sea polymetallic nodules,’ Journal of Cleaner Production, 275 (2020) 123822.