http://www.newscientist.com/article/mg20427281.300-posthuman-earth-how-the-planet-will-recover-from-us.html?DCMP=NLC-nletter&nsref=mg20427281.300 -- Carlos Contreras, presidente Club Científico de Peñalolén, Santiago, CHILE http://www.clubcientifico.cl fono/fax. 562-7691307 09-2114827