Nitrogen is extracted from air (which is 78% nitrogen), and combined with hydrogen to create ammonia. Doing this is doable with renewable energy, but it is sign

Nitrogen is extracted from air (which is 78% nitrogen), and combined with hydrogen to create ammonia. Doing this is doable with renewable energy, but it is significantly more expensive still vs using hydrogen from natural gas. As cost of natural gas has gone up (due to Russia not exporting as much), price of ammonia has followed.