To the extent that funds are available in the General Revenue Fund of the State, the General Assembly is authorized to direct the transfer, from time to time from the General Revenue Fund to the Anti-Pollution Bond Retirement and Interest Fund which separate fund in the State treasury is hereby created which when added to money received by such fund from other sources will be sufficient to pay the principal of and interest on the bonds provided for by this Act, as the same become due, and to the extent such transfer of funds is authorized by the General Assembly for that purpose, the taxes levied for the payment of the principal of and interest on such bonds as provided by Section 7 of this Act shall be abated.