The oversight/accountability/ /implementation responsibility will vary depending on the mandate given, as will the definition of risk/opportunity/possibility. Measurement of the exposure and assessment of the potential implications. Decision process and input, implementation, monitoring and reporting are key. For internal mandates and directly owned securities the Sustainability Advisory Group (see earlier answers) discuss, assess the risk and potential impact and make decisions on measures to be taken.
The Sustainability Team are responsible to see to that progress is achieved when it comes to measurement, knowledge, insight, tools and other means. They are also responsible to see to that the processes are functioning and developing. Monitoring, measurement and reporting are also part of their responsibility.
All portfolio managers, internal or external should consider sustainability in their processes and investments, both decision and monitoring. They should also be able to explain their decisions from an ESG perspective. ´This is an ongoing learning process and new factors are added over time.