Mass groundings of flights caused by the coronavirus are giving scientists a rare chance to study plane-free skies and pin down how far aviation stokes global warming. In response to the Covid-19 pandemic, air traffic has slumped in a manner not seen since the aftermath of the 9/11 attacks on the United States in 2001.Scientists with Nasa and European research groups hope to use clear skies to narrow down massive uncertainties about the warming effect of condensation trails – the wispy white lines that criss-cross the skies in the wake of jets engines.
By Alister Doyle. Climate Home News. April 9, 2020.