Spring’s start coming earlier, study blames global warming

Each spring, the robins are arriving in Wisconsin several days earlier than they did a decade ago. Endangered woodpeckers in North Carolina are laying their eggs about a week earlier than they did 20 years ago. And some of Washington, D.C.’s signature cherry trees bloom about a month earlier than they did a half-century ago. The first signs of spring are appearing earlier in the year, and a new study from Stanford University released Monday says man-made global warming is clearly to blame