SACRAMENTO--Assembly Speaker Fabian Nunez introduced legislation Monday to limit greenhouse gas emissions from power plants, oil refineries and other industrial sources, a step he said would lead the nation in combating global warming while spurring the state's economy. "(The bill) sends a loud and clear message to ... innovators and entrepreneurs here and abroad to develop and bring clean technologies into the California marketplace," the Los Angeles Democrat said. Nunez announced the legislation on the same day Gov. Arnold Schwarzenegger's administration released a report calling for development of economic incentives that could include emission caps to cut greenhouse gases, chiefly...