For generations, methane has slipped unseen through cracked pipes and open fields, a hazard and a warming force that human senses could not trace. Researchers at East China Normal University have now mounted a laboratory-grade spectroscopy instrument onto a moving vehicle, giving cities and utilities the ability to read the invisible chemistry of the air at highway speed. The system transforms a slow, piecemeal search into a continuous, mappable record — and in doing so, shifts the question from whether leaks can be found to whether the will exists to find them.