 In 2012, Ayotte voted with four other Republican senators to defeat a proposal to block the Environmental Protection Agency from promulgating the first federal standards regulating air pollution from power plants.In 2013, she voted for a point of order opposing a carbon tax or a fee on carbon emissions.Ayotte was one of two Republican senators to vote against a Republican measure, introduced by Roy Blunt, that sought to block President Obama from negotiating an international agreement on climate change.