AI가 비행기에 지구 데우는 '하늘 자국' 피하는 법 가르친다

Next time you look up at the sky, notice those long white lines behind airplanes. They look like chalk drawings on a board—beautiful to watch, but scientists say they are actually warming our planet.

These white trails are called condensation trails, or "contrails." They form when hot, humid air from plane engines meets cold air high above Earth. Water vapor turns into ice crystals, creating that familiar white line. The problem is not the trail itself—it is what happens next. These trails trap heat in our atmosphere, similar to how a greenhouse traps warmth. Over many hours, they can warm the Earth almost as much as the carbon dioxide that planes release.

A UK company is now testing a clever solution: artificial intelligence. The system works like a smart co-pilot. It gathers information about weather patterns, air temperature, and moisture levels at different flying heights. Then it suggests small changes to flight paths. A pilot might climb a few hundred meters higher or descend a bit lower to avoid the atmospheric conditions where contrails form most easily. These small adjustments do not add much time or fuel to a flight, but they could prevent contrails from forming.

Did you know that even tiny adjustments matter? Research shows that many contrails form in only narrow layers of the atmosphere. So moving a plane just slightly—sometimes only 2,000 feet up or down—can make a huge difference. The AI technology is designed to find these invisible "sweet spots" where planes can fly without creating harmful trails.

This trial is important because flying is growing fast around the world. More planes mean more contrails, and more warming. Airlines are eager to find solutions that help the environment without slowing down or costing too much money. AI offers something rare: a tool that may work right now, without waiting for brand-new aircraft or fuels.

The technology is not perfect yet. Weather changes constantly, and pilots still need to prioritize safety and schedule. But early results show promise. If this trial succeeds, the system could spread to other airlines and countries. It is a small example of how technology can help us address climate change in practical, everyday ways—one flight at a time.

What surprises you most about how airplane contrails affect the climate? Have you thought about the hidden environmental costs of flying?

Inspired by reporting from BBC News.