What I wonder about is whether there may not be a similar effect following this crisis--i.e., that shortly afterwards people will try to compensate for what they 'missed' during the crisis, potentially causing higher transport emissions than 'normal', until the emission reduction gains from this are made irrelevant again.
Lower public transport use is also an important cause, of course.
More total surprises--not:
https://www.theguardian.com/environment/2020/jun/11/carbon-emissions-in-surprisingly-rapid-surge-post-lockdown
As I wrote in the OP:
Lower public transport use is also an important cause, of course.