These factors include worldwide economic conditions; weather conditions and seasonal trends; the levels of domestic and Mexican natural gas production and consumer demand; fluctuations in demand from electric power generators and industrial customers; the availability of imported liquid natural gas (LNG); the ability to export LNG; the availability of transportation systems with adequate capacity; the volatility and uncertainty of regional pricing differences; the price and availability of alternative fuels; the effect of energy efficiency and conservation measures; the nature and extent of governmental regulation and taxation; worldwide political events, including, but not limited to, actions taken by foreign natural gas producing nations and changes in international trade laws, regulations, agreements, treaties or policies of the U.S. or other countries; and the anticipated future prices of natural gas, LNG and other commodities.