San Luis Obispo Tribune: For decades, California has set the pace for the country on air pollution and climate change, adopting ever-higher standards for controlling auto emissions and, more recently, greenhouse gases that scientists say have led to global warming. Now, California’s dominance is being challenged – under attack from another mega-state that wants to displace California by calling for a freeze of the status quo instead of a move toward tighter controls. Texas has refused to meet new federal greenhouse…