The reason stated was pests. Most likely both crop production and pesticide use will increase in the north, mostly due to increased temperature allowing for bo

The reason stated was pests. Most likely both crop production and pesticide use will increase in the north, mostly due to increased temperature allowing for both longer growing seasons and better conditions for pests. The CO2 effect will be dwarfed by the temperature effect in the north. The effect in the south will mostly be determined be access to water, either as rain or irrigation, and have huge local variations. Where there is good access to water, production will rise (due to increased CO2), where there isn't, it will drop. Overall, I'd expect a significant increase in crop production, but we may have to get used to new crops and varieties to get the full effect.