Also being underestimated is the effect climate change is already having. Polling has shown, most people under age 35 expect some bad stuff to happen in the years ahead. Many believe they can already see a decline in quality of life. I'm well over 35 and I see it too. Battling something like climate change is one of the prime reasons for having government. This meme that if people would just ride a bike to work climate change will go away is ridiculous. This isn't a problem we can solve one concerned citizen at a time.
I see your point, but I think it a disingenuous one.
I think that most people who care to give the issue thought realise that when the rubber hits the road the crux of the problem is the consumer-culture itself. The "right" is not being paranoid when they point out that much of what will likely need to be done if the greatest numbers of people are to come through this with the least suffering will resemble forms of Communism.
That is a dangerous "third-rail" consideration, as we have an entire world sustaining itself through manipulating that culture to their own benefit to one extent or another- and we are rightly terrified of the cultural and personal upheavals that will probably result from rejecting that model.
It may very well be the case that this problem could be solved by a sufficient number of people choosing to live in a much smaller house, ride a bike or use mass transit to travel, stop eating meat, stop purchasing 99% of the crap that we purchase, and otherwise behave as completely rational global citizens.
The downside, of course is the the complete economic collapse that would likely take place should a number of people sufficient to make a difference decide to take that route.
The irony not lost on those who might be willing to make those changes, is that by becoming the solution to the climate crisis they will put themselves in the position of martyrs, as the economic collapse will hurt them more than the people who continued to live like hogs.
Conversely, if they continue to consume like the hogs, they are also most likely to suffer the worst effects of the climate collapse.
The dilemma then, is how to avoid being a victim of the climate problem without becoming a martyr to the solution. The answer to that seems to be
forced collective action. Which is what I think you mean when you said "this isn't a problem we can solve one concerned citizens a time".
That is what Greta is a poster girl for. Of course it is for show. She need only show herself making an effort to be the concerned citizen (like the sailboat, and the Tesla), it is clear that those things are not the solution- but more importantly
they are not the solution she is urging. The solution she is selling is the
idea of collective action as something that is necessary, and what she is attempting (wittingly or not) is to indoctrinate the upcoming generation to embrace that idea.
Sorry for the ramble.