Photosynthesis efficiency?

Hello 1. Is it true that normally 2 hectares of wheat with 50 percent light intensity per square meter have a higher yield than one hectare with 100 percent light intensity? Is it because two hectares more photosynthesize, because there is more CO2, without which photosynthesis cannot take place, in the greenery? Photosynthesis doesn't work…

Would multi-level cultivation make sense worldwide?

Instead of normal cultivation, like wheat fields in monoculture? Or do we not yet know, do we need to conduct research? Could there be a way to harvest the plants and trees, perhaps with a net, without harming animals or machines or anything like that? I think it works in agroforestry, but would it perhaps…