Following California's lead, Rep. Spencer Black wants Wisconsin to do its part to address global warming by setting standards to reduce the state's greenhouse emissions by roughly 25 percent. Black, D-Madison, announced this morning he plans to introduce legislation that would require that greenhouse emissions be reduced to 1990 levels by 2029. He said the main sources of greenhouse gases in Wisconsin are power plants, especially coal-powered plants. But whatever plan is developed to reduce emissions could also include such measures as stricter emission standards for cars and incentives to purchase vehicles that run on bio-based fuels, which don't contribute...