Comment by Y-bar

Please not that this was in relation to whether or not a general doctor saves lives… A lot of work is indirect.

The Haber–Bosch process was never a two‑man mission to “feed the world.” Haber devised a laboratory method to fix nitrogen, and Bosch led the first industrial‑scale implementation, but neither of them was personally producing, optimizing, transporting, and applying fertilizer across the globe. Turning that reaction into most of the world’s nitrogen fertilizer required teams of chemists, engineers, metalworkers, factory operators, agronomists, logistics workers, and farmers, and an entire century of industrial expansion. If it truly were a two‑person accomplishment, we would only need a handful of farmers per country, which is obviously not how agriculture or industry work.