The Queen's state cars, for example, have been switched to liquefied petroleum gas, which emit low levels of toxic exhaust fumes. So too has the taxi used by the Duke of Edinburgh to drive anonymously around London.
The Queen's state cars, for example, have been switched to liquefied petroleum gas, which emit low levels of toxic exhaust fumes. So too has the taxi used by the Duke of Edinburgh to drive anonymously around London.
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