This is true, as is “We have 12 years to avoid catastrophe” and every other prediction of doom, but it is really hard to explain. We definitely won’t have 3 meters of sea level rise in 5 years or even by 2030. The climate, and shoreline, will likely be a bit worse than it is now. But without exceptionally rapid and drastic action now (that is, stop burning all fossil fuels in the next 5-12 years) we have locked in warming that will take us to that ultra-disaster of underwater cities and 200,000,000+ climate refugees in several steadily-worsening decades, and no one is sure when. At this point doubters conclude “They’re just fear-mongering liars, apocalypse is not actually going to happen in 5 years or even 12 years, nobody can really say, Algore said it would be awful years ago, still hasn’t happened.” The worse crisis is always about the apocalyptic climate N decades from now, unless we take drastic action that we should have started a decade ago. That’s a perfect recipe for defeatism and delay.
Children understand the problem, but a lot of well-meaning adults don’t 😢. Bill Nye swearing and blowtorching a globe isn’t going to change them, they’ll change when the present gets bad enough, when it will be far too late.
I tried to find models of the climate beyond 100 years from now. There aren’t any, because it’s so different from what we have now that the models don’t work. 😱 We don’t even know the current rate of warming because the climate zig-zags upwards. We’ll know in 20 years if it was 0.1 or 0.25°C per decade. Either will have been a disaster.