As long as we throw away what we produce with Glyphosate and the prices are rising anyway, what is the argument here? There is a lot we can do to produce more climate and environmentally sustainable until we actually would start to have less food.

Because we can't magically become more efficient. I suppose the increased prices have already helped with food waste and there should be some improvements made (e.g. better education about best before dates), but waste is unfortunately not easy to avoid. Humans screw up and therefore waste stuff. That's not going to change any time soon.

As I said there are drastic solutions and I am all for them, again, that would involve cutting down people's meat consumption to a fraction of where it is now and also things like widespread GMOs. Unfortunately however you don't get that done without starting riots.