Oil has ensured prosperity, but also triggers crises and wars. How did the Petroleum Age begin? What is oil? And does it have a future as an energy source?
Qatar is leaving OPEC. The Gulf country's government has said the move is mainly for economic reasons, but dramatically worsened ties with some of its neighbors also played a significant role.
Donald Trump's pledge that the US "won't put up with high oil prices for much longer" has led to speculation about how he may try to force OPEC's hand. Skepticism abounds over whether the price of gasoline will fall.
The oil pollution that has halted flows via the Druzhba ("Friendship") pipeline was deliberate, according to the Kremlin. But who might want to pull such a dirty trick? DW's Jo Harper has asked around.
Venezuela's socialist rulers have lived well off the nation's oil industry for many years. But planned US sanctions could call time on Nicolas Maduro's rule and stop the flow of foreign currency.
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