How is Russia to blame for all the food processing plants in the US that have mysteriously burned down during 2022? And lest we forget that global hunger was a massive problem long before "Russia's war". In 2019, this was estimated to cost well over 25 million lives per year (putting Covid in the shade). And this had nothing to do with the modern food system, and everything to do with poverty (something which has a simple cure for... fairer distribution of money).
If the modern food system is "reaching its limits", then the best thing to do is grow your own food. Then we can decide whether what we're told about climate change has any basis in reality.