This is a long-lead-time business; the investment horizon is five, 10 or 20 years. There's no switch to pull.

So the major obstacle to the development of new supplies is not geology but what happens above ground: international affairs, politics, investment and technology.

This is the fifth time that we're supposedly running out of oil,

Significant investment means the club have the playing resources to improve performances but with so many new team members time will be needed.

This is not the first time that the world has 'run out of oil. It's more like the fifth. Cycles of shortage and surplus characterize the entire history of the oil industry.

There is no off switch on a tiger