Environmental Protection Agency (EPA) Administrator Gina McCarthy holds up a pen before signing new emission guidelines during an announcement of a plan to cut carbon dioxide emissions from power plants by 30 percent by 2030, Monday, June 2, 2014, at EPA headquarters in Washington. In a sweeping initiative to curb pollutants blamed for global warming, the Obama administration unveiled a plan Monday that cuts carbon dioxide emissions from power plants by nearly a third over the next 15 years, but pushes the deadline for some states to comply until long after President Barack Obama leaves office. (AP Photo/ Evan Vucci)
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