Diminishing returns

Matthew R Simmons is convinced that Saudi oil production is near its peak, or indeed may have passed it, a development with awesome implications. Simmons, a veteran oil finance insider who has been an important adviser to the Bush administration, has done a huge amount of research and bases his conclusions on carefully sifted evidence, not large theories. Yet his view is consistent with the theory of M King Hubbert, a Shell geophysicist who argued in 1956 that production rates for oil and other fossil fuels exhibit a bell curve: when roughly half the oil has been extracted, production declines. No one took much notice of Hubbert at the time, but he predicted that oil production in the continental United States would peak and start declining in the late 1960s or early 1970s – as it did. Since then a number of large oilfields have also peaked, including the North Sea in 1999. When oil peaks it does not run out – there is usually a slow decline that can be spun out by new technologies – but the unavoidable result is falling production.