@vic @brett Starship uses liquid methane and liquid oxygen: CH4 + O2 => H2O + CO2. That is water and carbon dioxide, as in most kitchens.
Water can only go up to 100°C before vaporizing into a white cloud.
Starship is as environmentally friendly as a rocket could be. If successful, full reusability will eliminate the worst environmental impact of lifting mass to orbit: burning entire rocket stages as they re-enter into atmosphere 😱
Go Starship! 🚀