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| (Millions                of dollars)                                           |   | 2005   |   | 2004   |   | 2003   |   | 2002   |   | 2001   |   |
|--------------------------------------------------------------------------------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
|                                                                           |   |   |   |   |   |   |   |   |   |   |   |
| Earnings:                                                                      |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                   Income (loss) from continuing operations,          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                     before income taxes                    |   | $      | 1,434  |   | $      | 401    |   | $      | 140    |   | $      | (159 | ) | $ | 436 |   |
|                   Fixed charges                                      |   |   | 356    |   |   | 285    |   |   | 282    |   |   | 293 |   |   | 207 |   |
|                   Net loss on equity method investees                |   |   | 19     |   |   | 26     |   |   | 33     |   |   | 25 |   |   | 5 |   |
|                   Gain on sale of interest in equity method investee |   |   | (120   | )      |   | -      |   |   | -      |   |   | - |   |   | - |   |
|                   Distributed income from equity method investees    |   |   | 129    |   |   | 10     |   |   | 1      |   |   | - |   |   | - |   |
|                   Interest capitalized                               |   |   | (28    | )      |   | (13    | )      |   | (10    | )      |   | (7 | ) |   | (29 | ) |
|                                                                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total                earnings (loss)                                           |   | $      | 1,790  |   | $      | 709    |   | $      | 446    |   | $      | 152 |   | $ | 619 |   |
|                                                                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed                Charges -                                                 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                   Interest expense                                   |   | $      | 295    |   | $      | 244    |   | $      | 250    |   | $      | 267 |   | $ | 186 |   |
|                   Rental expense representative of interest factor   |   |   | 33     |   |   | 28     |   |   | 22     |   |   | 20 |   |   | 13 |   |
|                   Interest capitalized                               |   |   | 28     |   |   | 13     |   |   | 10     |   |   | 7 |   |   | 29 |   |
|                                                                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total                fixed charges                                             |   | $      | 356    |   | $      | 285    |   | $      | 282    |   | $      | 294 |   | $ | 228 |   |
|                                                                           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio                of earnings to fixed charges                              |   |   | 5.0    |   |   | 2.5    |   |   | 1.6    |   |   | 0.5 |   |   | 2.7 |   |