The article mentions "Traditional methods for ammonia production require high temperatures and pressures" in reference to the existing Haber-Bosch process for producing NH3 from thin air, an interesting historic story on its own.
https://blog.rootsofprogress.org/turning-air-into-bread
https://www.penguinrandomhouse.com/books/73464/the-alchemy-o...
+1 "alchemy of air" is a great read. The angle that would be most interesting to the HN crowd is that it exposed me to how much innovation was happening in chemistry in this pre-WWI era. Reminds me a bit of silicon valley.
The also a fascinating look at how the inventors got heavily caught up in WWI and WWII due to being in Germany and how tied up their industry became with government. Interesting to reflect on in current times.
Truly a great book.
https://www.liquium.nz/ is working on reducing the energy (a lot) required for the Haber-Bosch process.