Oil pushed higher despite the U.S. imposition of higher tariffs on Chinese goods, as rising tensions in Iran and elsewhere kept the supply outlook tight.

Airlines are starting to hedge against the risk that fuel prices could be driven higher by rules targeting another industry’s environmental performance.

Brent crude will reach $90 a barrel by 2020 as new international shipping regulations take effect, overhauling the types of fuels produced by refiners, Morgan Stanley analysts said in a report.

Crude rose to its highest level since 2014 in New York as the drop in U.S. inventories reported by an industry group helped to sustain a rally spurred by geopolitical risks.