Well, sure. Earth's population has grown roughly 100% in the past 50 years, largely due to the advances of Green Revolution agriculture. This isn't just nitroge

Well, sure. Earth's population has grown roughly 100% in the past 50 years, largely due to the advances of Green Revolution agriculture. This isn't just nitrogen fixing. It's advances in mechanization, transportation, finance, preservation techniques, and more. All of those things would have happened (more or less) even without fixed fertilizer. I disagree with the idea that there'd be proportionally less meat, for a couple of reasons. First, a lot of grazing-animal meat (beef, basically) comes from land that is unviable for plowing or other vegetation farming. Second, in the absence of inexpensive chemical fertilizer, manure would be a much more important fixer, just like it has been for thousands of years.