One might have the impression that hydraulic fracturing (fracking) of shale deposits is the answer to world energy security. Certainly fracking has received much attention and investment, but its prospects must be considered in a broader context. In the US, where practically all such operations have been conducted to date, fracking now accounts for 40% of domestic gas production and 30% of oil production. The price of natural gas has plummeted, and overall US oil production has increased for the first time since 1970, which had otherwise been falling in accordance with the predictions M King Hubbert made in 1956. © Shutterstock However, this last point is the salient one. Sources of unconventional oil (listed below) such as tight oil (or ‘shale oil’ in popular discourse) are only commercially viable because the need to match the declining rate of conventional oil production has raised oil prices. It is the […]