Another useless UN report on the cost of "containing rising temperatures to safe levels"

Bloomberg/Businessweek has got a copy of another useless UN global warming "report":

The cost of containing rising temperatures to safe levels may reach 4 percent of economic output by 2030, according to a draft United Nations report designed to influence talks for a global-warming treaty.
Most scenarios that meet the 2-degree Celsius (3.6-degree Fahrenheit) cap on global warming that world leaders endorse require a 40 percent to 70 percent reduction in heat-trapping gases by 2050 from 2010 levels, according to the third installment of the UN’s biggest-ever study of climate change. The world would need to triple the share of renewables, nuclear power and carbon-capture and storage to meet that.
“This report shows that 2 degrees is still technically possible and ought to remain the primary policy target” for climate negotiations that intend to produce a global agreement in 2015, said Bob Ward, policy director at the Grantham Research Institute on Climate Change and the Environment at the London School of Economics

PS

The good thing is of course, that this enormous waste of (taxpayers') money will never happen. By 2030 people (including climate scientists) will laugh at this pseudo-scientific UN nonsense. Unfortunately, before that, more than enough money will most likely be wasted on senseless global warming "projects".