SIR – Mr Goldsbrough (Letters, April 27) is right – there will always be oil in the ground, or in tar or coal, but the cost of production may be too high.
Fifty years ago, the investment of one barrel of oil produced up to 100 more, but now the same amount of energy only returns eight barrels in Saudi and about three in the United States. It’s even worse in Canada where to get three barrels of oil from the tar sands needs an investment of the energy of two barrels.
Oil will certainly be more expensive in the years to come and so can’t be taken for granted. Neither should it be as it’s a prime producer of CO2, and the sooner we replace it with renewable energy the better.
Keith Thomson, Heights Lane, Bradford
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