Those who are concerned about the use of fossil fuels are typically concerned about transportation and fossil fuels use in homes and industries. But they tend to ignore the fact that humans use a large amount of fossil fuels to make fertilizer to grow food. Without fertilizer there would be global starvation. Along with other uses of fossil fuels, the use of methane and fossil fuels for making fertilizer must be ended in order to stop global warming. Ammonia uses gray hydrogen, which is made from methane. The gray hydrogen must be replaced with green hydrogen, which is *not* made with fossil fuels; it’s made from water using renewable electricity.
“”Combined with the energy needed to produce hydrogen[note 1] and purified atmospheric nitrogen, ammonia production is energy-intensive, accounting for 1% to 2% of global energy consumption, 3% of global carbon emissions,[23] and 3% to 5% of natural gas consumption.[24]””
https://en.m.wikipedia.org/wiki/Haber_process