Agence France-Presse: California on Thursday unveiled a roadmap for its goal of slashing greenhouse gas emissions 30 percent over the next 12 years, describing global warming as the biggest threat facing the state. The California Air Resources Board (CARB) released a series of measures and policies in a draft plan which sets out a timetable for achieving emissions standards outlined in a 2006 bill signed by Governor Arnold Schwarzenegger. Among the measures set out in the plan are proposals for …