Chevron and Petrobras Analyze Biofuel's Impact on Foodbr World Petroleum Congress - World Petroleum Congressbr Industry leaders debate at the 19th WPC. With many of the remaining resources located in inhospitable areas or far below the sea floor, access to new reserves is becoming increasingly difficult and cost intensive.The IEA estimates that meeting global energy demands will require investing $1 trillion by 2030.Discussants include executive vice president of Chevron Corporation John S. Watson and Petrobras' CEO Jose Sergio Gabrielli de Azevedo. The high level session is chaired by H.E. Shri M. S. Srinivasan, Secretary of the Ministry of Petroleum and Natural Gas, India.