In March, Saudi Arabia's oil minister, Ali al-Nuaimi, said the country hopes to become as expert with solar energy as it is with oil.

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Mr Nuaimi argues that the poem was not directed specifically at the emir or the crown prince, but that offence was looked for by the authorities.

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"For a country like Saudi Arabia ... one of the most important sources of energy to look at and to develop is solar energy, " al-Nuaimi told the French oil newsletter Petrostrategies.

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