|Computation of Ratio of Earnings to Fixed Charges | Exhibit 7.1
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|(CAD in millions)                                                                                                           |  |             |        |   |             |  |       |             |  |  |             |   |  |             |      
|--------------------------------------------------------------------------------------------------------------------------- |  | ----------- | ------ | - | ----------- |  | ----- | ----------- |  |  | ----------- | - |  | ----------- | -----
|                                                                                                                            |  | Year Ended  |        |   | Year Ended  |  |       | Year Ended  |  |  | Year Ended  |   |  | Year Ended  |      
|                                                                                                                            |  | December 31 |        |   | December 31 |  |       | December 31 |  |  | December 31 |   |  | December 31 |      
|                                                                                                                            |  | 2008(3)     |        |   | 2009(3)     |  |       | 2010(3)     |  |  | 2011(4)     |   |  | 2012(4)     |      
|                                                                                                                            |  |             |        |   |             |  |       |             |  |  |             |   |  |             |      
|Earnings:                                                                                                                   |  |             |        |   |             |  |       |             |  |  |             |   |  |             |      
|Income
    (loss) from continuing operations before income taxes, equity in net losses of affiliates and minority interests |  |             | (996.1 | ) |             |  | 435.7 |             |  |  | 272.2       |   |  |             | 289.3
|Pre-tax dividends requirements                                                                                              |  |             | (14.8  | ) |             |  | (19.9 | )           |  |  | (17.7       | ) |  |             | (13.8
|Fixed charges                                                                                                               |  |             | 311.5  |   |             |  | 307.1 |             |  |  | 245.0       |   |  |             | 237.7
|Amortization of capitalized
    interest                                                                                    |  |             | 13.8   |   |             |  | 17.0  |             |  |  | 18.1        |   |  |             | 17.2 
|Capitalized
    interest                                                                                                    |  |             | (39.0  | ) |             |  | (19.4 | )           |  |  | (14.6       | ) |  |             | (32.0
|Earnings
    adjusted for fixed charges                                                                                     |  |             | (724.6 | ) |             |  | 720.5 |             |  |  | 503.0       |   |  |             | 498.4
|                                                                                                                            |  |             |        |   |             |  |       |             |  |  |             |   |  |             |      
|Fixed
    charges:                                                                                                          |  |             |        |   |             |  |       |             |  |  |             |   |  |             |      
|Pre-tax preferred dividends                                                                                                 |  |             | 14.8   |   |             |  | 19.9  |             |  |  | (17.7       | ) |  |             | (13.8
|Interest expensed and
    capitalized, including amortization of capitalized expenses related to indebtedness               |  |             | 286.5  |   |             |  | 278.6 |             |  |  | 255.4       |   |  |             | 244.8
|Portion
    or rent expense representative of interest (1)                                                                  |  |             | 10.2   |   |             |  | 8.6   |             |  |  | 7.3         |   |  |             | 6.7  
|Total
    fixed charges                                                                                                     |  |             | 311.5  |   |             |  | 307.1 |             |  |  | 245.0       |   |  |             | 237.7
|                                                                                                                            |  |             |        |   |             |  |       |             |  |  |             |   |  |             |      
|Ratio of earnings to fixed
    charges (2)                                                                                  |  |             | -      |   |             |  | 2.3   |             |  |  | 2.1         |   |  |             | 2.1  



|(1) | One quarter of rent expense is deemed to be representative of interest.
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|(2) | For purposes of calculating the ratio of earnings to fixed charges, earnings represent income from continuing operations before income taxes, less capitalized interest and pre-tax preferred dividends, plus amortization of capitalized interest and fixed charges.  Fixed charges include interest expense (including amortization of debt issuance costs), pre-tax preferred dividends, capitalized interest and the portion of operating rental expense that our management believes is representative of the interest component of rent expense.  The ratio of earnings to fixed charges is not presented for the  year ended December 31, 2008 as the earnings were inadequate to cover fixed charges during that period.
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|(3) | Based on numbers prepared in accordance with Canadian Accepted Accounting Principles    
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|(4) | Based on numbers prepared in accordance with International Financing Reporting Standards