Norway's $820 billion sovereign wealth fund, one of the world's largest investors, sold its holdings in 73 companies during 2015 – a new high for the organisation – as it sets tougher standards on climate change and human rights.

The fund, known as the Government Pension Fund Global, invests in over 9,000 listed companies worldwide, but has been divesting from an increasing number of them as its investment managers develop "risk-based" analyses of environmental and social issues.