Evolution has been good at getting photosynthesis as efficient as possible in the most extreme cases. In rice and all other C3 plants, it could be at least 50%

Evolution has been good at getting photosynthesis as efficient as possible in the most extreme cases. In rice and all other C3 plants, it could be at least 50% more efficient in the majority of field situations. That's what we work on. Projected yield improvements are on the order of 50%. Absolutely agree about the importance of post-harvest problem-solving, but I disagree about the benefit/cost ratio. There are a few key things in photosynthesis which, if achieved (which won't cost that much), could have massive benefits. In post-harvest research there are many small, localised problems that change over time. It's a less tractable, but extremely important, set of problems.