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Why is oil so important as an energy source?
Crude oil has been critical for economic development and the smooth functioning of almost every aspect of society. Agriculture and food production is heavily dependent on oil for fuel and fertilisers. In the US, for instance, it takes the direct and indirect use of about six barrels of oil to raise one beef steer. It is the basis of most transport systems. Oil is also crucial to the drugs and chemicals industries and is a strategic asset for the military.

How are oil reserves estimated?

The amount of oil recoverable is always going to be an assessment subject to the vagaries of economics – which determines the price of the oil and whether it is worth the costs of pumping it out –and technology, which determines how easy it is to discover and recover. Probable reserves have a better than 50 per cent chance of getting oil out. Possible reserves have less than 50 per cent chance.

Why is there such disagreement over oil reserves?

All numbers tend to be informed estimates. Different experts make different assumptions so it is under- standable that they can come to different conclusions. Some countries see the size of their oilfields as a national security issue and do not want to provide accurate information. Another problem concerns how fast oil production is declining in fields that are past their peak production. The rate of decline can vary from field to field and this affects calculations on the size of the reserves. A further factor is the expected size of future demand for oil.

What is "peak oil" and when will it be reached?

This is the point when the maximum rate at which oil is extracted reaches a peak because of technical and geological constraints, with global production going into decline from then on. The UK Government, along with many other governments, has believed that peak oil will not occur until well into the 21st Century, at least not until after 2030. The International Energy Agency believes peak oil will come perhaps by 2020. But it also believes that we are heading for an even earlier "oil crunch" because demand after 2010 is likely to exceed dwindling supplies.

With global warming, why should we be worried about peak oil?

There are large reserves of non-conventional oil, such as the tar sands of Canada. But this oil is dirty and will produce vast amounts of carbon dioxide which will make a nonsense of any climate change agreement. Another problem concerns how fast oil production is declining in fields that are past their peak production. The rate of decline can vary from field to field and this affects calculations on the size of the reserves. If we are not adequately prepared for peak oil, global warming could become far worse than expected.