Despite the European Union's decision last year to label nuclear energy as sustainable, none of the world's 30 major banks explicitly included nuclear energy in their criteria for issuing green or sustainability-linked bonds, the researchers found. The study surveyed 30 banks deemed systemically important by the Financial Stability Board and found that 17 explicitly excluded nuclear energy from their green financing frameworks. The EU's green bond standards include nuclear power, but excluding it could limit the sector's access to growing sustainable capital. Nuclear power isn't considered climate-damaging, but it does produce radioactive waste. Countries such as Germany and Austria oppose nuclear energy, citing concerns about waste disposal, accidents and delays.