Oil production in the U.S. and many other countries is declining because of depletion of the resource base. Production of natural gas in North American has likewise declined. Now that the U.S. is dependent on global energy resources for supplies of oil and gas, dare I ask the obvious question?how long will global energy resources last? USEIA?s International Energy Outlook 2004 projects that global crude oil production (including natural gas liquids) will go from 30 billion barrels in 2004 to 44 billion barrels in 2025. If this rate of increase were projected onward, the world would be burning 61 billion barrels a year by 2050. Is this likely or even possible? Or should we prepare for the eventuality that energy resources may be depleted globally and reduce the amount of oil and gas available in the foreseeable future? The best data on global energy resources that I know of were assembled by the U.S. Geological Survey and published as World Petroleum Assessment 2000. In the extended EIA scenario, virtually all the remaining oil estimated by USGS would be gone by 2050. I conclude that the effects of global resource depletion will limit oil production well before. Scenarios in which oil supplies continue to increase indefinitely are unrealistic. The future remains uncertain, of course. New technology and higher prices will increase resource availability. Unconventional resources such as tar sands and oil shale will also play a role. USGS may be mistaken. Nevertheless, the best numbers we have indicate that the world will begin feeling the effects of oil depletion within a decade or so, if it hasn?t already. Natural gas resources would follow a similar path somewhat later. Now that our country is dependent on global energy resources, a rational U.S. energy policy would seriously consider how quickly these resources are being depleted. But apparently the subject of resource depletion is taboo for politicians, both red and blue.