why are they fucked? you can just switch to plants grown previously further down the south, you can already now grow figs, lemons, etc. for instance, let alone tomatoes/peppers
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> you can just
No you cannot "just" do things like that sadly... you still need water, as much as 10L/day/sqm during a heat wave. Also you need proper night/day temperature cycles, a reasonable early/late frost timing as to not kill your new plants, the soil has to match what you want to grow, etc. it's a whole dance between many many factors.
Flowers and pollen also get absolutely fucked by high heat, tomatoes stop growing when it's too warm. I know a farm where they lost most of their tomatoes, they cooked on the plant and fell to the ground.
Though the rest of the year will be hot and dry, the winters will still be freezing, which limits what you can do, and late spring frost which kills fruit buds is very common.
We should just turn some fields into PV plants...