The New Zealand Superannuation Fund has shifted $25 billion of investments - around 40 per cent of its total portfolio - into low carbon indices.
The changes apply to the fund's index-tracking reference portfolio benchmark and its passive investments in global equities.
Stephen Gilmore, NZ Super Fund chief investment officer, said the changes would reduce the fund's exposure to carbon emissions and bring its investments in line with the Paris Agreement - the international climate change treaty.
"Making this shift in a way that will not have a detrimental impact on investment returns has been critical for us. The move follows many months of technical analysis weighing up a range of risk, return, cost and implementation considerations.
"We're confident fund performance will not be adversely affected and see both cost and efficiency benefits in the changes. The new indices provide a simple, off-the-shelf solution for our passive benchmark and holdings."