Associated Press: Power plants and refineries continue to rank among the biggest emitters of greenhouse gas emissions in Washington in 2012, according to the latest data reported to the U.S. Environmental Protection Agency. In 2012, 90 large sources in the state reported releasing a total of 19.2 million metric tons of carbon dioxide, methane and other greenhouse gases, about an 8 percent drop from the year before, the data shows. The TransAlta coal-fired power plant in Centralia continued to be the single largest...