Scientific American: High in the Peruvian Andes 8,000 alpacas died during a particularly harsh period of cold in the summer of 2004. For the herders who raise and shear these long-haired beasts for a living, it was a huge loss amounting to one fifth of all the alpacas living in that region of the highlands. Since then international aid organizations have worked with local herders to prevent future losses in the face of extreme cold snaps that seem to be occurring more frequently there with climate change. Together, they...