[flavius29663]

> even if CO2 magically made the food both more nutrient-dense and with higher growth rate

I just detailed on how that will happen, no need to use magic. Increased CO2 will be better for plants worldwide (including deserts) and for agriculture, that's maybe the one positive thing I can find about global warming.

[whycombinetor]

What, you and I are typing right now in a comment thread precisely about increased CO2 resulting in lower nutrient density, so no, you haven't detailed how that will happen.

[flavius29663]

you need to use less land for the same amount of poor calories (rice,corn,wheat,potatoes), and use the remaining land for highly nutritional food