If the carbon is much higher today, then could the conclusion be that they are not the factor, or that they are beneficial? Heres some stats, many factors make

If the carbon is much higher today, then could the conclusion be that they are not the factor, or that they are beneficial? Heres some stats, many factors make up the efficiency, but as plants are carbon sinks, it would be a bold claim to make that it has not helped crop yields. https://www.farmprogress.com/equipment/eight-major-factors-have-changed-agriculture-last-50-years https://www.farmprogress.com/equipment/eight-major-factors-h... Localized effects are easier to calculate, but there are many factor. For example soybeans grow better under less sunlight, so the effect of a darker sky is higher yields. You are correct that is isn't a single effect its very dynamic and has many effects.