ScienceGlobal issuesWhat are contrails and how do they form?To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScienceGlobal issuesRené Wilbrandt10/24/2023October 24, 2023Condensation trails are linear artificial clouds that form from the exhaust of airplanes. Do they have an effect on the climate? This week's viewer question comes from Al Ben M. in Panama.https://p.dw.com/p/4XnIwAdvertisement