Gina McCarthy, administrator of the Environmental Protection Agency (EPA), asked scientists at a climate change conference on Thursday in Arlington, Va., to help advance President Barack Obama’s agenda on climate change. […] Peter Saundry, executive director of NCSE, introduced McCarthy by noting Obama’s pledge to act unilaterally on climate change. “President Obama has announced that he will work with Congress whenever he can but will not be held hostage—will move forward and do the utmost, we hope, through executive authority and through the agencies,” Saundry said. “The Supreme Court has noted that EPA has authority under (the) Clean Air Act...