(a) If any provision of this part is determined to be invalid, such invalidity shall not affect other provisions of this part.
(b) If federal legislation or a federal court stays, invalidates, delays the effective date of, or otherwise renders unenforceable, in whole or in part, the United States Environmental Protection Agency’s regulation of greenhouse gases, then the provisions of this part concerning greenhouse gases based thereon shall be stayed and shall not be enforceable until such time as the Arkansas Pollution Control and Ecology Commission makes a final decision on whether or not to revise this part due to the federal legislation or federal court order.