That's the whole point - to raise questions and open up the debate.....
That is not the point - it has all the characteristics of a delaying tactic and an unwillingness to address a well documented issue for which there is extensive science evidence..
Believing that nothing workable is feasible can be a legitimate opinion. If you are over 60 and care not for future generations it is a reasonable point of view. Just be honest about it!
The UK and other wealthy countries may be able to largely ignore climate change. We have the resources and skill base to mitigate and/or adapt to most impacts.
It needs investment and commitment to attain self sufficiency in green energy, food, and most things a modern society requires. A strategy implemented now would need to be sustained for several decades but is entirely feasible.
As a plan, it has the characteristics of individual "preppers" who believe that they can survive whilst the rest of society perishes, albeit on a national basis. When the "balloon goes up" we close the borders, hunker down, shoot all who risk our national security.
There are parallels with covid - only when images of overwhelmed Italian hospitals were broadcast was it plausible that a lockdown could be implemented. Consider the likely level of compliance were lockdown imposed (say) 6 weeks earlier with no visible evidence/narrative.
This may mean waiting until central London is under water with the barrier breached, flooding in low lying areas of the UK, imagery of survivors clinging to the last palm tree still above water on an island in the Pacific, etc etc. Then it will be an actionable emergency - just a few decades too late to have much effect.