By Barbara Lewis and Simon Jessop

A report by Two Degrees Investing Initiative showed the average equity manager sold their entire portfolio every 21 months, a pace that shows the influence of equity analysts focused on quarterly reports and more short-term returns.

The think-tank, which is helping the European Commission review policy proposals for European governments on market regulations, said this investment churn stopped businesses plotting for the long term and could short-change shareholders.

The European Union wants to reform capital markets, which it says could do more to redistribute money from polluting industries to greener ones but which are now not encouraging investors to integrate sustainability into their decisions.

The founder of Two Degrees Investing Initiative, Stanislas Dupre, addressed the European Commission in Brussels this week about sustainable investing. He is part of an expert group drawing up policy recommendations by year-end.

"There are hundreds of pieces of regulation which could be changed," said Dupre.

He said 80 percent of the value of most shares is based on extrapolating current trends, rather than looking further out to when it could be altered by new technology or climate change.

"It's not necessarily changes in regulation, it might be more precise guidance from the market authorities," he said, adding such changes could include fresh guidance around risk disclosures and offering a timeframe for those risks to help investors.

Such rules would help the management of pension schemes which must make payouts to pensioners many years into the future.

As well as EU support, Dupre's group also has backing from the French and German governments, as well as insurers AXA (>> AXA) and Allianz (>> Allianz SE).

(Editing by Edmund Blair)

Stocks treated in this article : AXA, Allianz SE