There's a BBC documentary that suggest contrails and pollutants help block the sunlight from reaching the earth, and that the airspace lockdown lead to a slight

There's a BBC documentary that suggest contrails and pollutants help block the sunlight from reaching the earth, and that the airspace lockdown lead to a slight warming: https://www.dailymotion.com/video/x7p6z05 https://www.dailymotion.com/video/x7p6z05 But newer research says the Covid reduction of flights caused only very small warming (and not even cooling): https://en.wikipedia.org/wiki/Global_dimming https://en.wikipedia.org/wiki/Global_dimming: > The global response to the 2020 coronavirus pandemic led to a reduction in global air traffic of nearly 70% relative to 2019. Thus, it provided an extended opportunity to study the impact of contrails on regional and global temperature. Multiple studies found "no significant response of diurnal surface air temperature range" as the result of contrail changes, and either "no net significant global ERF" (effective radiative forcing) or a very small warming effect. On the other hand, the decline in sulfate emissions caused by the curtailed road traffic and industrial output during the COVID-19 lockdowns did have a detectable warming impact: it was estimated to have increased global temperatures by 0.01–0.02 °C initially and up to 0.03 °C by 2023, before disappearing.