It would involve the use of gigantic hoses or high-powered chemical cannons to spray chemicals into the stratosphere to act as a reflective barrier against sunlight and harmful UV rays.
So while we can't say with 100% certainty that New Mutants isn't in the MCU, probably don't expect Wolfsbane and Cannonball to be hanging out with Groot and Rocket anytime soon.
Haven't got to charge at the muskets, haven't got to load the cannons, haven't got to freeze to death in the icy waters of the Atlantic for the women and children.