At-a-glance: The world's oil
How long will it last?

The short answer is no-one knows, but even the oil industry suspects the world "peak" is now approaching.

It says it has 40 years of proven reserves at the moment - but it also said that 30 years ago.

In fact, the estimate has actually increased in recent years as production has fallen. Cutting consumption would prolong oil's life.

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