Agence France-Presse: Climate change is pushing some bird species “towards extinction,” US Interior Secretary Ken Salazar warned Thursday as a new report on the threats facing North American birds was released. “For well over a century, migratory birds have faced stresses,” Salazar said. “Now they are facing a new threat — climate change — that could dramatically alter their habitat and food supply and push many species towards extinction.” Birds that depend upon the ocean for survival “are among …