But even then for a long haul, that stuff isn’t as significant. Conversely, for a puddle jumper with quick turn around, not as much either.
Supersonic passenger jets are likely to burn three to four times as much fuel per business-class passenger as standard passenger jets.
Solving global climate change requires rethinking energy generation, ground and sea shipping, transportation, heating, and addressing deforestation. It will not be solved by banning plastic straws, sorting your garbage, or even driving an electric car (though switching to electric cars is a very good step towards electric trucks, and will have a noticeable impact, unlike this niche airliner).
Don't ban niche things just because they contain something that is immoral at scale. EVERYTHING is immoral at scale, including eating food or breathing. We need to address and manage our problems to allow humanity to live, not die by a thousand self-hating cuts. Optimization is always addressed by looking at the 80%, not the 20%.
Maybe once this jet is in the air, if fuel expenditure is at all a concern, we can figure out how to address the efficiency concerns once we have the rest of the problems of aerodynamics and the infrastructure to manufacture this sorted out.
And if we can get cost competitive carbon neutral fuel creation going (a la Prometheus fuels), I’m generally for this.