[jandrewrogers]

On the other hand, higher weather variance reduces average yields to an extent that dwarfs any benefit from higher CO2. Increased yield unpredictability is a much bigger problem for the agricultural supply chain because it increases average unit costs.

[ETH_start]

Massively increases vegetation cover while reducing farm yields? I find that highly implausible.

One critical impact of higher CO2 concentrations is that drier climates see more vegetation, so you see a lot of greening in previously arid, barren places. And that also has massively positive implications for farm yields.