JOINT FILING AGREEMENT
Published on December 13, 2007
Exhibit 99.2
JOINT FILING AGREEMENT
PURSUANT TO RULE 13d-1(k)(1)
The undersigned acknowledge and agree that the foregoing statement on Schedule
13D is filed on behalf of each of the undersigned and that all subsequent
amendments to this statement on Schedule 13D shall be filed on behalf of each of
the undersigned without the necessity of filing additional joint filing
agreements. The undersigned acknowledge that each shall be responsible for the
timely filing of such amendments, and for the completeness and accuracy of the
information concerning him or her contained therein, but shall not be
responsible for the completeness and accuracy of the information concerning the
other, except to the extent that he or she knows or has reason to believe that
such information is inaccurate. This Agreement may be executed in any number of
counterparts and all such counterparts taken together shall constitute one and
the same instrument.
Date: December 13, 2007
/s/ Boone Picken
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Boone Pickens
/s/ Madeleine Pickens
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Madeleine Pickens