Could these new supersonic jets be the future of low-carbon air travel?

After the Concorde was retired almost twenty years ago, because of both economic and environmental concerns, supersonic passenger flights ended. However, now supersonic jets are poised to make a comback in a new and cleaner form. The company Boom is aiming for an affordable supersonic passenger jet, which runs on a net zero carbon fuel. Is this going to be a profitable and environmentally-friendly solution to super-fast air travel?