Yes, Mark, I also wonder how the intended contributions will be met. However, they are only "intended" contributions and someone else will be in charge by the time that the contribution has to be met, so it will be someone else's failure. I have no illusions about actions being taken, because the concentration of GGs in the atmosphere keep rising and so do emissions (though there is a rumour that emissions didn't rise last year), despite the enormity of our predicament having been known for a long time. I have little doubt that the economy comes first for most major countries (and many others), with a habitable environment being well down the list of priorities.
But individual actions can certainly be taken and I'd concur that growing at least some of your own food would be a big step to resilience. We're going to have to learn to live with climate change, whether we manage to mitigate some of the impacts, or not.