(The Center Square) – A Washington state appeals court heard arguments Tuesday in a case that could impact the Climate Commitment Act and taxpayers. The case was originally filed in July 2023 by a private citizen and Oak Harbor Freight Lines in Thurston County Superior Court against a state transportation revenue bill passed in 2022. The plaintiffs argued the $17 billion transportation package in the form of Senate Bill 5974 violated the state constitution’s single-subject requirement. Under Article 2 Section 19, the state constitution stipulates that “no bill shall embrace more than one subje…