Then fine, it&#x27;s probably 5% if you count them in. It doesn&#x27;t change the fact that all the machines we now have, combined with the fertilizer revolution of the early XX century that started with the Haber process[0], has increased the food production output per worker by orders of magnitude.<p>[0] - <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Haber_process" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Haber_process</a>