With President-elect Donald J. Trump promising to dump the Paris climate accord, there is uncertainty that he might also shoot down a historic and hard-won deal to cut emissions from air travel. Last month airlines, aircraft manufacturers and oil companies from nearly 200 countries forged a global deal to cut carbon pollution starting in 2021. The question on everyone’s mind is what happens now. “Trump is a business person and this [deal] is business-driven,” says Jim Macias, CEO of Fulcrum BioEnergy, which is  backed by BP and United Airlines. “He won’t be a champion of this but I don’t think he will get in the way.” Macias believes most changes in energy policy will be focused on reversing regulations on drilling, pipelines, and other corners of the energy sector.