By Nina Chestney LONDON, Nov 16 (Reuters) - Stronger domestic and international policy is needed to help unlock investment in low-carbon technology in the absence of a global climate deal, investors with over $15 trillion of assets said on Tuesday. A United Nations summit in Cancun, Mexico, starts in just two weeks' time to negotiate a new global climate deal but expectations have sunk to a modest package that includes a fund to manage aid to poor nations, new ways to share clean technology and to protect tropical forests. Around 260 investors, including Dutch pension fund ATP, HSBC and Deutsche Bank Asset Management, called for Cancun to deliver $30 billion of climate aid promised last year, in a statement released by the U.N. Environment Programme Finance Initiative.

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