Venezuela's oil is also of poorer quality than its Saudi equivalent. Its sour, heavy crude is difficult to extract and refine, while its high sulphur content makes it corrosive to pipelines. A resurgence of Venezuela's industry could pose problems for Canada, which produces similarly viscous oil and exports much of it to the US, but analysts reckon the risk is minor.
Chris Fayers, head of environment at Hinkley Point C, said the testing had gone "really well"
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Медведев вышел в финал турнира в Дубае17:59
Мерц резко сменил риторику во время встречи в Китае09:25
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Nature staff discuss some of the week’s top science news.