Millions of people make small changes to distract themselves from changes that would make a real difference. Not doing anything may at least have a chance of making them aware that something must be done.
You'll notice this phenomenon in lots of areas, first of all fitness.
But that's just my opinion.
However, a certain amount of activity is required to maintain a minimal amount of fitness. Smart training can even take, in worst case, one hour a week.
What I typically observe in people who refuse to do even the bare minimum of activity, is that they find a "non-activity", and pretend it works.
What they're actually doing is instead to find something that takes virtually no effort while giving the illusion that they've absolved the duty.
Very typical non-activities: walking and climbing stairs.
(This is a bit complex suject of course, because if we take somebody who sits 24/7 on a chair/couch, of course walking is better than nothing - but I'm referring to the principle)
However, this is a bit odd in context. If one considers a population where 60%+ of the population has 30%+ of bodyfat percentage, then it's impossible to define what constitutes fitness - even one flight of stairs, in a sense, requires a decent amount of training.
In at least northern Europe, hiking is relatively common for elderlies (people in their 60s) - and this amounts to hours of walking in rough terrains, so definitely, for a person who's not (considerably) overweight, and hour of walks in the city is... a walk in the park.
This year has been the perfect experiment: Through massive, massive, restrictions in our normal life we managed to reduce CO2 emissions by what, 30%? Say we could do it even better if everyone became vegan and only rode bicycles and we reduce them by 70%. Awesome. That about triples the time we have until we need to reach net zero emissions. It probably also crashes the economy that's supposed to pay for the modernization and replacement of our whole energy infrastructure.
most likely 4-6% by the end of the year is europe goes back to the same lockdown as in march.
To reduce that to needed levels by 2050 (to reach the 2°C by 2100 "best" scenario), you need -5% every year since last year. Its in the bag for 2020 at least, so that's great.