The potent pollution from so-called “megaconstellation” satellite systems launched en masse into space since 2019 will account for nearly half (42%) of the total climate impact of space sector pollution by the end of the decade, finds a new study led by UCL researchers.
Elon says they will eventually make methane from carbon captured from the air and be carbon neutral, but I’ll believe it when I see it. They currently bring in 200 tankers per launch to make propellant, including LNG. Sounds like they are building facilities to extract oxygen and nitrogen from the air, but I’m guessing they’ll still need 30-50 trucks of LNG per launch.
https://arstechnica.com/space/2025/09/spacex-moves-closer-to-making-its-own-rocket-fuel-at-starship-launch-site/
I suppose it depends on cost, and how many launches they actually do. Trucking in LNG can’t be very efficient or scalable.