Factors that could cause results to differ include, but are not limited to: the impact of significant declines in prices for crude oil, bitumen, natural gas, LNG and natural gas liquids; potential failures or delays in achieving expected reserve or production levels from future oil and gas developments, including due to operating hazards, drilling risks and the inherent uncertainties in predicting reserves and reservoir performance; unsuccessful exploratory drilling activities or the inability to obtain access to exploratory acreage; legislative and regulatory initiatives addressing environmental concerns, including initiatives addressing the impact of global climate change or further regulating hydraulic fracturing, methane emissions, flaring or water disposal; reduced demand for our products or the use of competing energy products, including alternative energy sources; substantial investment in and development of alternative energy sources, including as a result of existing or future environmental rules and regulations; general domestic and international economic and political developments, including changes in governmental policies relating to crude oil, bitumen, natural gas, LNG and natural gas liquids pricing, regulation or taxation; competition in the oil and gas exploration and production industry; failures in risk management and other factors discussed in this report and described in Item Risk Factors in our 2018 Annual Report on Form 10-K and any additional risks described in our other filings with the Securities and Exchange Commission (SEC) .