Saudi Arabia has called for greater global cooperation in increasing upstream investments and expanding and upgrading refining capacity to ensure the world's energy future. Saudi Aramco President and Chief Executive Officer Abdallah S. Jum'ah told an energy conference in Houston that oil-producing nations were likely to build more refineries because of hurdles oil companies face in developing new plants in consuming countries. Jum'ah's remarks came in a keynote address he delivered on Tuesday at the prestigious Oil Summit of the Cambridge Energy Research Association's Annual Conference (CERA Week 2005), under the theme "Rising to the Challenge: Securing the Energy Future." The conference, being held Feb. 14-18, is attended by more than 1,500 top energy executives, policymakers and energy analysts from over 50 countries, according to information available. --MORE 1030 Local Time 0730 GMT