California air quality officials reported that for the fourth consecutive year carbon emissions from power plants in the state have declined dramatically. A full-year figure for 2012 is still being calculated, according to the California Air Resources Board (CARB), which is the lead agency implementing the state’s precedent-setting 2006 climate change law (AB 32). As measured by CARB, power plant carbon dioxide equivalent (CO2e) emissions in 2011 totaled 34.9 million metric tons of CO2e (MTCO2e), compared to 52.3 million MTCO2e four years earlier. Subsequently, the totals dropped to 49.3 million MTCO2e in 2009 and down further to 44.6 million MTCO2e in 2010. Power plants are the biggest stationary source of MTCO2e emissions, followed by refineries and hydrogen plants, whose total emissions are also down compared to 2008 but have steadily risen during the last three recorded years (2009-2011).

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