With what we have already emitted today (and we are still increasing our emissions every year), it is not clear at all that Europe will always have enough food in the next few decades. I don't know about the US, but seeing the fires in the last few years, I guess it's not far.
Growth definitely means reduced standard of living in our lifetime: we are going towards global instability, wars and famines.
Degrowth means reduced standard of living as well: just trying to keep them as high as possible. Everybody wants the same thing: the highest possible standard of living. Degrowth advocates have just accepted that it will get down in the future.