The way it's "sustainable" is that it's not a fossil fuel (well, currently it's 50% fossil fuel, they hope it can be 100% fossil fuel free by 2030), so it's jus

The way it's "sustainable" is that it's not a fossil fuel (well, currently it's 50% fossil fuel, they hope it can be 100% fossil fuel free by 2030), so it's just part of the normal carbon cycle like forest fires and breathing. IMO it's probably just a stand-in until hydrogen really works.