LOS ANGELES, Aug. 15 (Xinhua) -- Six Mexican border states pledged on Friday to strengthen cooperation with California in fighting climate change and increase green investment through Public Private Partnerships. As part of the cooperation, the six Mexican border states -- Sonora, Baja California, Chihuahua, Coahuila, Nuevo Leon and Tamaulipas -- and California have joined together with Pacific Gas& Electric (PG&E) and the California Climate Action Registry (CCAR)in a Memorandum of Understanding (MOU) to combat climate change, California Governor Arnold Schwarzenegger said at an annual U.S-Mexican Border Governors Conference being held in Hollywood, Los Angeles. California and the Mexican border...