http://www.agu.org/pubs/crossref/2012/2011GL050226.shtml
Obviously the authors are paid shills of the tar sands industry.
"Our analysis also leads to a relatively low and tightly-constrained estimate of Transient Climate Response of 1.3–1.8C, and relatively low projections of 21st-century warming under the Representative Concentration Pathways. Repeating our attribution analysis with a second model (CNRM-CM5) gives consistent results, albeit with somewhat larger uncertainties. "
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If you really want fast, use discreet Walsh-Hadamard xform and look-up tables.
http://www.agu.org/pubs/crossref/2012/2011GL050226.shtml Obviously the authors are paid shills of the tar sands industry. "Our analysis also leads to a relatively low and tightly-constrained estimate of Transient Climate Response of 1.3–1.8C, and relatively low projections of 21st-century warming under the Representative Concentration Pathways. Repeating our attribution analysis with a second model (CNRM-CM5) gives consistent results, albeit with somewhat larger uncertainties. "