CARBON RULES: The Obama administration's rules currently in the works for coal-fired power plants sent senators into a frenzy on Tuesday.

In a Senate Environment and Public Works Committee hearing on Obama's nominee for assistant secretary of the Environmental Protection Agency's Office of Air and Radiation, Janet McCabe, lawmakers took jabs at each other on the impacts of climate change.

Republicans argued that the president's greenhouse gas emission targets don't warrant the EPA limits on carbon pollution from coal-fired power plants.

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