Depends if political stability can be maintained. The Earth produces enough food now to feed about 10B people, a roughly 50% increase over total world population. We still have famine because of distribution problems: the food doesn't get to people who need it, and instead gets hoarded by those with power.
Global warming isn't likely to cut total arable land or food production (if anything, it'll likely increase it), but it definitely changes the distribution of arable land. Current breadbaskets like Southern Europe, South Asia, and Brazil might see frequent droughts; currently desolate areas like the Sahara or Canadian Shield may become fertile again. If countries can work out trade deals so that food gets to where it needs to, things can work out. If they start closing borders and saying "fuck you I got mine", there will be widespread starvation and war in many regions.
I'd lean towards a view that those are long-term outcomes that might take thousands of years to materialize. But things like ocean acidification and permafrost methane release are currently looking unstoppable.
Canada and Russia becoming new bread baskets is a possible near-term future, but you'll have a lower total amount of incident input energy at those latitudes, meaning that even greater arable land areas will produce significantly less food.
Global warming isn't likely to cut total arable land or food production (if anything, it'll likely increase it), but it definitely changes the distribution of arable land. Current breadbaskets like Southern Europe, South Asia, and Brazil might see frequent droughts; currently desolate areas like the Sahara or Canadian Shield may become fertile again. If countries can work out trade deals so that food gets to where it needs to, things can work out. If they start closing borders and saying "fuck you I got mine", there will be widespread starvation and war in many regions.