RALEIGH - A nonprofit environmental advocacy group, which staunchly believes global warming must be reduced through reductions in human-caused carbon dioxide emissions, controls another nonprofit organization that advises a climate action panel started by the N.C. Division of Air Quality. The DAQ-created group, in turn, makes recommendations on carbon-dioxide reductions to the Legislative Commission on Global Climate Change. The advisory organization, the Center for Climate Strategies, is Pennsylvania-based and helped establish the study commission through a proposal to DAQ. But there is question whether the study panel, called the Climate Action Plan Advisory Group (CAPAG), is authorized under N.C. law.