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HARRISBURG, Pa. (AP) — Pennsylvania’s Republican-controlled Legislature has failed in a last-ditch effort to block the centerpiece of Gov. Tom Wolf’s plan to fight climate change, a regulation requiring fossil fuel-fired power plants to pay a price for every ton of carbon dioxide they emit. A 32-17 vote Monday in the state Senate failed to reach a two-thirds threshold to block a regulation written by Wolf’s administration that could make Pennsylvania the first major fossil fuel state to adopt a carbon pricing policy. It still could face a legal challenge in the courts from opponents. Otherwise, the compliance obligation on power plants that are subject to the regulation could start July 1.