I mean you can read past the headline and see why. Aerosols like sulfates, nitrates and soot cool the planet. These are mainly caused by industrial activities and traffic. Reduce them because of a pandemic and the temperature will go up:

https://earthobservatory.nasa.gov/features/Aerosols/page3.php

Happened also after Septemeber 11th, where the absence of air traffic and thus contrails increased surface temperatures.

And before someone asks why we don't cool the planet by pumping out atmosphere full with aerosols, it's because of this:

https://www.epa.gov/acidrain/what-acid-rain

I mean you can read past the headline and see why. Aerosols like sulfates, nitrates and soot cool the planet. These are mainly caused by industrial activities and traffic. Reduce them because of a pandemic and the temperature will go up:

https://earthobservatory.nasa.gov/features/Aerosols/page3.php

Happened also after Septemeber 11th, were the absence of air traffic and thus contrails increased surface temperatures.

And before someone asks why we don't cool the planet by pumping out atmosphere full with aerosols, it's because of this:

https://www.epa.gov/acidrain/what-acid-rain