In 2007, the UN climate convention（大会，协定） came up with a sum of $49-171bn per year.
The new report says the UN sums omitted important factors and the true cost will be two to three times higher.
Developing nations want rich countries to provide major sums for adaptation as part of the new UN climate deal due to be agreed in Copenhagen in December.
"The amount of money on the table at Copenhagen is one of the key factors that will determine whether we achieve a climate change agreement," said lead author Martin Parry, a visiting research fellow with the Grantham Institute for Climate Change at Imperial College London.
"But previous estimates of adaptation costs have substantially misjudged the scale of funds needed."
The new report - issued under the aegis3 of（在……支持下） the International Institute for Environment and Development (IIED) and the Grantham Institute - says that some aspects of the UN estimates were wrong by a factor of more than 100.
Call to caution
The UN climate convention (UNFCCC) made its assessment（评估） in 2007 after the IPCC concluded the task was too difficult; and Professor Parry suggested it had been done in a hurry, with some vital caveats4（警告） ignored in subsequent deliberations.
Recently the UNFCCC's executive secretary Yvo de Boer has tended to use the figure of $100bn (£60bn) per year.
Professor Parry told BBC News that a key point of the new report, Assessing the Costs of Adaptation to Climate Change, was that it included "bottom-up" as well as "top-down" analyses.
"So when you start adding up the various figures you soon start to exceed the global number (in the UN's analysis)."
He said UNFCCC calculations had taken into account only half of the extra disease burden due to emerge from climate change, assumed low levels of future development in Africa (so giving less infrastructure8 to protect), used low estimates for sea level rise and had not included the economic costs of nature loss.
Securing funds for climate protection, or adaptation, is a key priority for developing countries in the run-up to the Copenhagen conference, which is supposed to secure a new global agreement supplanting9（排挤，取代） the Kyoto Protocol10.
Earlier this week the African Union suggested it would be asking for $67bn (£40bn) per year for Africa alone.
"But if governments are working with the wrong numbers, we could end up with a false deal that fails to cover the costs of adaptation to climate change."
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