Originally Posted by TwitchKitty

The issue here is bioavailability. The nitrogen is not chemically available for use by people unless it is recombined into a different form. It just isn't available in nature without industrial means.

Read about bioavailability of nitrogen and nitrogen fixing.

Haber-Bosch makes the nitrogen available. The nitrogen in our bodies came from cheap petroleum. It would not have been available without cheap petroleum. Control of petroleum is control of the world. This is why grain grown in the US sells for less overseas than the people there can grow it themselves, even though it cost more to grow it here than it would cost to grow it there, so much for supply and demand.