Extreme weather is straining poorer countries' finances, the bank says
The bank's World Development Report (WDR) urges a rapid scaling-up of spending on clean energy research and protection for poorer countries.
Even a warming of 2C (3.6F) - the G8's target - could reduce GDP in poor nations, the report concludes.
"For that reason, an equitable deal in Copenhagen is vitally important."
Part of that deal, the report says, involves industrialised countries making rapid cuts in their greenhouse gas output, creating "emissions space" to allow for rising fossil fuel use in poorer societies.
"A broad coalition6（结合，合并） from Bolivian President Evo Morales to the World Bank is united in saying that past emissions matter, and that rich countries have to confront this rather than avoid it," noted7 Tom Sherman, head of climate change with the charity ActionAid.
The report concludes that policy "cannot be framed as a choice between growth and climate change".
In fact, it says, "climate-smart policies are those that enhance development, reduce vulnerability（易受伤，弱点） and finance the transition to low-carbon economic growth".
Poor countries in Africa and Asia could see their GDP fall by about 5% under a global warming of 2C - the target adopted by the G8 and a number of important developing countries during their summit in Italy in July.
"Grappling with climate shocks that are already hampering9 development will not be easy," said Rosina Bierbaum, co-director of the WDR and dean of the University of Michigan's School of Natural Resources and Environment.
The full financing package that the bank believes is likely to be needed annually11 by 2030 includes:
And the vast majority, it concludes, must come from nations that have already industrialised through intensive fossil fuel use.
The bank's explicit12（明确的，详述的） conclusions - that climate change has to be curbed to aid development, and that richer countries have to pay - will harden the case that developing countries are making for more cash in the lead up to Copenhagen.
It parts company with some observers who argue that climate change should only be addressed once societies have become rich enough to solve it painlessly: "Development will get harder, not easier, with climate change".
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