Generating the necessary high pressure demands a significant amount of energy, which is quite expensive. The dangers of high pressures are real. Due to the hydrogen gas being used, using high pressures may be extremely risky since they might result in explosions. Haber's process emits a significant quantity of CO2. 1.87 tons of CO2 are released into the atmosphere along with every ton of ammonia generated, which contributes 1.2% of the world's total CO2 emissions and lowers average global temperatures.