A crazy cold week in Florida brings starker contrails. But it's just winter conspiring against us, not the feds trying to change the weather.

American Airlines and Google were able to cut contrails made by jets by more than half during a small trial, a move that could significantly reduce the global-warming footprint of the travel industry, ...

Taking a day flight could be a swift way to limit the climate impact of a holiday, as new research suggests vapour trails produced by jets can cool the planet during the daytime. Soot particles ...

Scientific debate is getting heated over what to do about airplane contrails—the wispy lines of water vapor you often see trailing behind a jet. Those harmless-looking vapor trails sometimes spread ...