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U.S. climate action received support yesterday from four former EPA administrators who served Republican presidents. William D. Ruckelshaus, Lee M. Thomas, William K. Reilly, and Christine Todd Whitman testified before the Senate’s Environment and Public Works Committee at a hearing entitled “Climate Change: The Need to Act Now.”

They delivered a clear message for Congress: Climate change is one of the greatest threats to America’s economy, environment, and communities—and it need not be a partisan issue.

On Monday, the Environmental Protection Agency announced its Clean Power Plan, the first time the United States has set standards to limit carbon pollution from existing power plants. The Plan sets emissions reduction goals for individual states; once the goals are finalized next year, states will develop plans to achieve the necessary reductions. EPA’s modeling indicates that the standards will reduce national carbon pollution from power plants by 30 percent below 2005 levels by 2030.

The EPA's proposed rule to cut carbon pollution from power plants is a critical step in avoiding the worst consequences of global warming. Without significant reductions from the power sector—America’s largest source of greenhouse gas emissions—the country cannot meet its goal of reducing its emissions 17 percent below 2005 levels by 2020. EPA’s proposal provides a flexible framework that puts those reductions within reach.

Here’s a look at how the proposed rule would impact states and the future of U.S. climate action.

On June 2, President Obama will unveil the latest—and likely greatest—emissions reduction policy since he announced his Climate Action Plan last year: new rules to limit carbon dioxide pollution from existing power plants. With power plants accounting for around one-third of U.S. emissions, these rules will address the country’s single-largest source of greenhouse gas pollution.

Unfortunately, there are a lot of misconceptions on what these standards are designed to achieve, the impact they will have, and why they’re so important. This blog highlights some of the most important aspects of these crucial actions.

Arkansas has already taken steps to reduce its near-term power sector CO2 emissions by implementing energy efficiency policies. And the state has the opportunity to go even further. In fact, new WRI analysis finds that Arkansas can reduce its CO2 emissions 39 percent below 2011 levels by 2020 by implementing new clean energy strategies and taking advantage of existing infrastructure. Achieving these reductions will allow Arkansas to meet moderately ambitious EPA power plant emissions standards, which are due to be finalized in 2015.

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