While they didn’t go to far into why corn was becoming extinct, I think they alluded to it significantly enough to lead us to “they tried but couldn’t succeed”. The most obvious reason for this would be the dust blocking out the sun. I believe that’s tangible. Quick google searches lead me to some information saying that corn needs about 6 hours of full sun to grow. If that’s not there, it can’t survive.

So.. tangible solutions... indoor growing? For the entire population? No that’s out. Again, quick googling, we have about 89 million acres of land in the us alone growing corn. Grow in space? Ideally maybe, economically no.

You seem to want to hate the movie more than to have actually reasoned with it’s plausibility if these are the only reasons you have to dislike it.

The love thing.. yeah that left a salty taste in my mouth.