I've only scanned the article but another factor that might come into play is crop nutrient content. There's some research that suggests that plants growing wit

I've only scanned the article but another factor that might come into play is crop nutrient content. There's some research that suggests that plants growing with more CO2 around contain less nutrient content relative to their weight - see e.g. https://www.vox.com/2018/5/24/17384110/rice-vitamin-nutrition-food-security-co2 https://www.vox.com/2018/5/24/17384110/rice-vitamin-nutritio...