The real game changer for farming would be direct synthesis of food, avoiding using plants for energy or CO2 capture. But this is tough to make work economical

The real game changer for farming would be direct synthesis of food, avoiding using plants for energy or CO2 capture. But this is tough to make work economically. The easiest target would be single cell protein, for example ICI's Pruteen or more recently Quorn. Perhaps if renewable electricity continues to decline in price it will become more feasible.