Institutional investors managing £15 trillion of assets have called for an ambitious global climate deal to give them certainty to invest in clean technology.

More than 340 institutions including BlackRock, the world's largest asset manager, AXA Group and Legal & General Investment Management, have called for strong policies to drive action on climate change.

The organisations want governments to put a "stable, reliable and economically meaningful" price that polluters have to pay for their carbon emissions, which will help scale up investment towards clean power and energy efficiency.

Ahead of a UN climate summit in New York next week, the investors called on governments to phase out subsidies for fossil fuels.

The institutions warned that experts say an extra $1 trillion (£600 billion) a year on average up to 2050 is needed to limit temperature rises to 2C.

Global investment in clean energy in 2013 was just $254 billion (£160 billion).

In a statement, the investors, who also include the BBC Pension Trust, BT Pension Scheme, Aviva Investors, Standard Life Investments and Church Commissioners for England, set out action they will take to tackle climate change.