Should we upgrade photosynthesis and grow supercrops?

[DetlefK]

6. What is that supposed to mean?

1. Why would collective intelligence be needed to draw such a conclusion?

2. Nature's laws? That depends. Scientific theories are actually more tricky and convoluted than you think.
Some are derived from other theories via mathematics. We know where they come from, we know what they do, we don't know if they are realistic.
Other "laws of nature" are derived empirically. It works, but we have no idea why.

Once I read an online-comment where somebody demanded that scientists stop trying to find out the small issues and try deciphering the final law of nature that everything depends on. Once we have that figured out, all the rest can be deduced form it.

That's what people often forget about science: It's always guess-work and nothing can be proven with ultimate certainty.
Newton's laws? A variant of the theory of special relativity.
Newtonian theory of gravity? A part of the theory of common relativity.
Born's interpretation of quantum-mechanics? Invalid once we go to relativistic systems.

There is no way of knowing whether the "laws of nature" you consider infallible actually have a loophole that we haven't discovered yet.