Crop yields have trended up for the past century. CO2 fertilization improves crop yields. Edit reply: Yes, it has. This macronutrient myth has to do with the p

Crop yields have trended up for the past century. CO2 fertilization improves crop yields. Edit reply: Yes, it has. This macronutrient myth has to do with the profile of carbs to proteins shifting by single digit percentages, whereas crops will produce more carbs per gram and less protein per gram under higher CO2. The effect is extremely minimal. In soy beans, it's just 2% difference. Either way, when your yields double and you lose 2-10% protein per gram, you are still producing more food overall. This has nothing to do with GMOs. It's just a natural effect of photosynthesis. Most plants are C3 plants, which means genetically they are optimized for CO2 levels that are at least 3x higher than modern levels. It is theorized that this is because plants evolved under these conditions for millions of years. Only very recently in geological terms, did Earth's CO2 levels drop to sub-1000 ppm. https://www.cropsreview.com/c3-plants.html https://www.cropsreview.com/c3-plants.html