From Jan. 1, 2020, most of the merchant fleet will have to burn fuel containing less sulfur than it does today under rules set out by the International Maritime Organization, part of the United Nations. There’s been some speculation that the regulations might get delayed, since they’re expected to affect everything from oil prices to world trade. The IMO’s not budging. “It’s very important we go forward and give people confidence that the implementation date will go ahead,” Edmund Hughes, head of air pollution and energy efficiency at the IMO’s marine environment division, said in an interview in Singapore.