Any supplementary agreement entered into pursuant to Article 4 of the Interstate Environmental Compact and requiring the expenditure of funds or the assumption of an obligation to expend funds shall not become effective as to this state prior to the making of an appropriation therefor by the General Assembly, with the following exceptions:
(1) The Governor may use special appropriations as are made available for emergency purposes;
(2) The Governor may use any such funds as are made available to him or her by the United States Government or any other source specifically for the creation and implementation of supplemental agreements under this subchapter; and
(3) Where an agency of the state can better carry out the purpose for which it was created by the legislature by cooperative actions with other states under the terms of the compact, that agency may, with the consent of the Governor, expend funds appropriated to the agency for such purposes.