Tree-ring samples taken by Paulo Quadri, who earned a Ph.D. in environmental studies from UC Santa Cruz, were included in the study. (Photo by Luz A. de Wit) The top-line findings of a massive ...

Thanks for liking this story! We have added it to a list of your favorite stories. CATHY WURZER: After 20 years of research, scientists at the University of Minnesota Duluth just unveiled a new kind ...