How do we keep the benefits?

The pandemic lockdown has been a terrible experience for the world as a whole yet there have been a few unintended but positive benefits. Pollution levels have dropped, the roads are much quieter, congestion has been significantly cut, the environment is getting better. The issue is, when we return to "normal" (whatever that turns out to be), how do we keep the environmental benefits we have unexpectedly experienced? I speculated on this when I walked through the empty roads of our village at the end of April when I went to and from our smallholding to lock up the henhouses in the evening. I don't claim to have the answers but just as coronavirus kills, so does pollution. We need to build a world in which both are eradicated.