It’s hard to say exactly which foods we will be forced to eat, in Earth’s CO2- and O3-stuffed atmosphere.
But it is likely those foods will be genetically modified to counter the toxic effects of these atmospheric gases, and to maintain their nutritional value.
Global food security in a changing climate depends on the nutritional value and yield of staple food crops. Researchers at Monash University in Victoria, Australia have found an increase in toxic compounds, a decrease in protein content and a decreased yield in plants grown under high CO2 and drought conditions.

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I’ve been batting around this idea for a novel for a while — about a future where organic produce is condemned and outlawed as wasteful and inefficient, and people turn to a booming black market for organic vegetables run by drug cartels and smugglers.