To really make a big change to the numbers we need to make the kind of big changes in life that we did in 2020. Not in the same way, with more normal life but the same amount of change.
We, single people, can do that by changing what we do, like not traveling as much, or changing what we buy to do that, like the kind of vehicles we travel in.
Probably right now it needs to be some part of both of those.