AGREEMENT Pursuant to Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned agree that the Schedule 13D to which this Agreement is attached as Exhibit 1 is filed on behalf of each of us. This Agreement may be...

                                                                       EXHIBIT 1


                                    AGREEMENT

         Pursuant to Rule 13d-1(k) promulgated under the Securities Exchange Act
of 1934, as amended, the undersigned agree that the Schedule 13D to which this
Agreement is attached as Exhibit 1 is filed on behalf of each of us. This
Agreement may be executed in two or more counterparts, each of which shall be
deemed an original, but all of which together shall constitute one and the same
agreement.


Dated:  May 12, 2005

                                         OCCIDENTAL PETROLEUM CORPORATION


                                         By:     /s/ J.R. Xxxxxx
                                                 -------------------------------
                                         Name:   J.R. Xxxxxx
                                         Title:  Vice President and Treasurer


                                         OCCIDENTAL PETROLEUM INVESTMENT CO.


                                         By:     /s/ J.R. Xxxxxx
                                                 -------------------------------
                                         Name:   J.R. Xxxxxx
                                         Title:  Vice President and Treasurer


                                         OCCIDENTAL CHEMICAL HOLDING CORPORATION


                                         By:     /s/ J.R. Xxxxxx
                                                 -------------------------------
                                         Name:   J.R. Xxxxxx
                                         Title:  Vice President and Treasurer