Reaction Engines Breakthrough Could Mean Four Hour Flights To Anywhere In The World

[AtheistCrusader]

9. If by that you mean H/LOX, technically true

or potentially true, depending on the energy source used to obtain the hydrogen and liquid oxygen. (Hydro, wind, solar can be carbon neutral, or mostly neutral)

LOX/Kerosene not so much. Most solid propellants also have carbon cost in obtaining the materials put into the fuel, like aluminium, which has to be mined, smelted, prepared, etc, and a lot of that involves generating carbon.

But potentially, depending on the fuel, and the methods used to prepare it, it can be nearly carbon neutral.