"Lawmakers are working on a compromise to an amendment that risks stalling an otherwise popular energy package.
The American Energy Innovation Act would spur research and development into a number of types of energy, the first major package on the topic in over a decade.
But an amendment to phase down the use of hydrofluorocarbons (HFCs) used in refrigerators and air conditioners is holding up a broader vote.
Sen. John Barrasso (R-Wyo.) is fighting for language that would block states from setting their own stricter standards on the substance. "