The United Arab Emirates said on Tuesday that it was quitting Opec, dealing a heavy blow to the oil-exporting cartel and its de facto leader, Saudi Arabia, at a time when the Iran war has caused a historic energy shock and rattled the global economy. But what is Opec, and how does it impact consumers? What is Opec? Founded in 1960, the Organisation of the Petroleum Exporting Countries (Opec) is a bloc of oil-exporting nations that coordinate their oil and gas policies as a means of managing t...