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(Bloomberg) — Temperatures in Europe are getting close to levels at which some oil refineries would have to start making less fuel.

Greece is battling wildfires and the nation’s capital could see temperatures above 40C (104F) in the coming weeks. In Poland, heat may soon exceed the point at which the country’s top fuel supplier can run its refineries normally. Macquarie Group estimates that heat-related disruption at European plants reached about 1 million barrels-a-day last year — almost 10% of what they normally handle.