One thing I hope environmentalists are doing is collecting some real good data. No way you can get such info if it wasn't because of this pandemic - you could get a pretty good idea of how much emissions and pollution air travel, cruises, cars, and manufacturing companies expel. How else are you going to get such dramatic results of before and after?
Coronavirus: Air pollution and CO2 fall rapidly as virus spreads
https://www.bbc.com/news/science-environment-51944780