If "they" said;
Stick at one or two kids
Use less wherever possible, from as close to you as possible
Fix it rather than buy new where possible
Pollute less
Grow your own if you can
How many people would argue with that?
The outcome from doing that may mean big industry doesn't get quite what it hoped, it may mean no EVs, supermarkets may sell less junk.
"Them" saying you must and will do xyz will creat a negative personal reaction even before the individual starts looking at what the facts might be. Picking your scientists backing up your viewpoint, with graphs showing, for instance, a massive increase in CO2 with the start point of that graph chosen to illustrate your point most dramatically but which diminishes to nothing over a much longer time line becomes much less convincing as soon as you find another, perhaps more accredited scientist saying the opposite, at least until they are discredited.
No fear created then, no new EV/heat pump/turbine purchased then.
It may be factual that CO2 has risen since the Industrial Revolution, which since the UK was at the forefront of that means we must beg forgiveness more fervently than any other country, but the increase since then is surely irrelevant as soon as you look further back as I tried to point out with the massive graph I posted previously? The rate of increase may take us back to a level seen a very long time ago if nothing changed over the next few centuries but is nothing changing?
Global Warming was renamed. The climate is changing, why is that bad? The blatent use of fear with Covid behaviours shows more plainly what is being done with Climate Change and that approach will not help "their" cause, whatever that actually is. Even if you have bought an EV, moved into a new, insulated, heat pumped, city centre tiny house and have been double jabbed and boostered there will be something else coming soon to argue about. The Emperor's new clothes.
If you don't turn the MSM on you wouldn't even know you're supposed to be worried