It’s essential to replace aviation fuel with a zero carbon alternative, says Mike Mason. But hydrogen is too difficult, batteries are too heavy, and biofuels would need too much land. Green Ammonia, with about half the energy density of kerosene, is the best available choice.

In this 2021 talk to the Oxford Energy Network, Mike Mason argues the case for Green ammonia - made from sunshine air and water - as a fuel. It has huge benefits over hydrogen: cheap to make in sunny places with the next generation of solar PV; easy to store; easy to transport across the globe; safe; and useable as it is; or readily convertible to hydrogen.