This work was accomplished by the help of the Foundation for Climate and Sustainability (FCS), a private nonprofit foundation, and despite the drastic reduction of public funding for research pursued by the Italian government (see the article “Cut-Throat Savings,” Nature, Vol. 455, October 2008, available online at http://www.nature.com/nature/journal/v455/n7215/full/455835b.html). Thanks are due to Massimiliamo Pasqui and Jacopo Primicerio for stimulating discussions and to Andrea Orlandi and Alberto Ortolani for their useful suggestions and encouragement.
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