I remember reading some articles about that. According to Musk, the carbon footprint from the rocket fuel is a tiny fraction of that done by ordinary airplane travel. Rockets don't fly every day, but airplanes do. So we shouldn't blame rockets for carbon emissions, we should blame jet airplanes.
Musk oughtta know, he puts on 100s of thousands of miles on his G650 every year
He wants them to fly every day. Trip from NY to Shanghai in 39 minutes, https://www.youtube.com/watch?v=zqE-ultsWt0
2 minute video